Site offering a list of sites classified by categories. The classification is made in a tree-like aspect of categories, sensible cover all or part centers of interest of the visitors. Contrary to research motors: - Classification in directories is accomplished by human beings - Directories classify websites (http: // www.exemple.com) and not pages (http: // www.exemple.com / exemple.html).

Link entering towards a page of a website. If the B page makes a link towards the page A, then B is a backlink of A. The number of backlinks and the PageRank ™ of these backlinks constitute one of the criteria employed by Google in the positioning of Web pages on the requests of its visitors. The more the A page includes backlinks with well PageRank ™ and with a topic close to his, the more the PageRank ™ of the page A will be well and better will be the popularity of this page, will with a positive impact on the positioning of this last by Google. Hence the importance of the installation of an appropriate exchange of links’ strategy (A and B make a reciprocal link towards each, causing a mutual benefit for every part).

Zones of html code generally at the head of version html on every page of a Website, in the part “Head". It allows to include information designed for robots during their passage on the page for the indexation of Web pages on motors.
Meta Tags most used are:
- Title corresponds as the title of the page (about 60 characters),
- Description corresponds to the description of the page (about 250 characters),
- Keywords correspond to key words linked to the page (5 - 6 key words),
- Tags h1 to h6 (located in the part "Body" of the page) allow organization into a hierarchy by important levels of the subtitles of the page, h1 being the most important hierarchic level,
- Robot allows / prevents robots going through the page to index its contents and to follow links hypertexts which are there.

Sanction consisting of the abolition by a research motor of all pages of an index’s site. Here are some practices that can lead to a black-list:
- Pages containing hidden text for the internaut but visible for the research motor (cloaking),
- Pages of redirection taking back a maximum of time interesting words,
- Specific pages for the research motor and for the internaut,
- Pages containing links towards sites considered suspicious by research motors.

The checksum of a file is a sequence of figures and letters defining precisely (but not unique) a file to know if it was corrupted. Google also uses a checksum algorithm to encode exchanges of data between her toolbar and his servers.

Technique aiming at ameliorating the positioning of a page within research motors by providing in these last a version different from that visible by the internauts. This practice, considered as of the spamdexing, can be source of black-list.

See "Advertising Positioning".

Tools returning various information about URL. Form "control: www.exemple.com ", they are directly grabbed in research fields Google (without inverted commas). List of most employed Google Controls:
- Link returns the list of the backlinks of grabbed URL.
- Site returns the list of the pages of the grabbed site (work only with grabbed name of domain. Eg: www.exemple.com) indexed by Google.
- Information returns the information of grabbed URL if this last is indexed by Google.
- Related returns the list of the pages that, according to Google, the topic is close of grabbed URL.

Number of pages classified by research motors for one (couple of) keywords(s). Coupled with a qualitative analysis of pages put in first position of the results of research motors on your requests, it determines the feasibility of a positioning: the more competition is big and the more PageRank ™ of the "leader" is well brought up, the more positioning is difficult. Every motor displays the competition linked to grabbed request, at the head of its pages of results. Each of them has his own way to index Web pages; the competition for the same request is variable from a motor to the other one.

(Combination of) grabbed term (s) by the internauts representative of the contents waited by these last in results shown by research motors.

See « Robot (of indexation) ».

Massive indexation of the web by Googlebot in the course of which it analyses in depth all pages of sites, and lists all links particularly. In general, it starts just after Google Dance and acts as a basis in Google Dance which follows.

Repetition of one (couple of) keyword(s) given in comparison with the total number of present words in a page.

Name of the directory of the plan ODP (Open Directory Project), the biggest and the most complete of the directories of the web edited by human beings. It is developed and maintained by a vast huge worldwide community of voluntary editors. Google uses her method of classification to index the present sites on the Web.

See “Backlinks (BL)”.

See “Sanbox”.

See “RSS”.

Daily exam of the web by GoogleBot, specialized on the newly published pages. According to various criteria, a page will be visited in a frequency varying between 12 hours and about 1 month.

Program of advertising affiliation of Google allowing to generate incomes from the pages of a Website on which Google AdSense broadcasts announcements literal and illustrated in direct report with the contents of the Website.

See “Advertising Positioning”.

Google APIs (Program Interface application) is a kit of available software development freely, which allows to create new applications using directly the database of pages indexed by Google, by means of a service web.

Technique of reference aiming at influencing the classification of a page in the results of the research motor Google. This technique exploits a characteristic of the motor PageRank ™ which grants a certain weight in the text including a link hypertext towards a page. This weight can vary according to the algorithm used employed by Google. If several sites use the same text to clock in on the same target, Google figures up this weight and it becomes possible to show the target page in the results of a research on the text contained in links clocking in towards her.

Period during Google updates the PageRank ™ values and the list of the backlinks of pages indexed in its basis.

Data centers of Google are the places where are located servers of the research motor. There are in several places divided on the planet (at the moment in the United States and in Europe).

Toolbar located in the top of the Internet navigator notably allowing the data entry of key words as part of a research, the blockage of pop-ups, a highlighter of keywords, and also the PageRank ™ display of the visited page, via the checksum Google. To download here.

Name of the indexation robot of the Web pages of Google.

See “Reference”.

Method allowing to link up a word, an expression or a picture of a document to a resource (Web page, file, etc). A click on a link hypertext allows to access to this resource.

See “BackLink”.

See “Advertising Positioning”.

In a supplementary manner in the directories which work to take a census of sites, research motors perform, them, a deep work to list pages inside these sites, via the use of robots of indexation.

See “Backlinks”.

Content modifications of a Web page to acquire a good positioning on the pages of results of research motors.

See “Advertising Positioning”.

See “Backlinks”.

Web page towards which clocks in no link since another page. The only way to access an orphan page is therefore to know her URL.

Homepage of a Website including an only link hypertext by which the visitor accesses a new page, she allows to achieve the rest of the pages of the site. This page, often made up of a look and a message of welcome, brings nothing, either to the visitors, or to robots. It causes an access in "funnel" to the site as well as a lengthening of the course-visitor of an additional click, what can be source of penalty of all the pages of the site by research motors.

Indication of popularity of a Web page going from 0 to 10, calculated to a very sophisticated algorithm worked out by Google, it appears on the toolbar Google. It is linked in number and in the quality of the backlinks of a Web page: the more the Web page includes backlinks with high PageRank ™ and with a close topic to his, the more PageRank ™ of the Web page will be in its well brought up turn and better what will be the popularity of this page, will with a positive impact on the positioning of this last by Google.

Number of data entries of one (couple of) keywords(s) by the internauts on research motors: the more the number of data entries is well brought up, the more positioning is appropriate.

See “PageRank (PR)”.

Way a research tool classifies the pages of results of its index in order of pertinence for one (couple of) keywords (s) given. The most appropriate sites appear in first on the page of results during a specific request. There are 2 kinds of positioning: natural positioning and advertising positioning.

Positioning of a Web page emanating from a counting performed by the algorithm of pertinence of the research tool, and not on the basis of paid performance. This positioning was acquired, most often, by optimization of the html code of the Web page according to criteria of pertinence of the research motor.

See “Advertising Positioning”.

Fact to buy his rank to research motors: the link so put at the head of the results of motors is said sponsored. ,
It is possible to be situated in the very first places of Yahoo! by buying her position to Overture, the sales positioning service of Yahoo! newly reappointed Yahoo Search Marketing. ,
Google, via his commercial program AdWords, gives a visibility to the affiliated members in a frame devoted to the commercial links, often put above or on the side of the page of results of researches performed by the internauts, about which positioning is said natural. ,
Commercial links are mostly pointed out and often invoice to the « expense by click » (the affiliated member pays only when link is clicked by an internaut).

Position of arrival of a Web page in the result pages of a research performed on research motors.

Fact to show (many pages of) a Website in the index of research motors, do not mix up with positioning. This term is also employed as part of the inscription of a Website on a directory.

Software which goes through the web of page in page by borrowing links hypertexts which are in them, and analyses and indexes contents in a database. He acts for a research motor.

Text file of small size put in the root directory of a Website forbidding the access of certain directories of the site in a robot. It is used when the webmaster does not wish that certain pages of his site are indexed by research motors.

Abbreviation of Really Simple Syndication, a way to extract from Website of contents regularly put in day. A file RSS is a simple text file in the format XML including the short description of the contents of the site.

Penalty inflicted by Google on the new sites, which prevents them to benefit of a quality positioning on terms with strong competition during a period of quarantine, that can last several months. The concerned sites have no problem of indexation but they are seldom visible in the first pages of research results.

Identical copy of a Website. This oblique technique, close to spamdexing, permits a high presence on research motors. The most part of the actual motors succeed in recognizing and in moving aside sites mirrors.

Excessive technique consisting in deceiving robots to acquire a better positioning. For instance, some Webmaster include white key words on a white bottom so that they are invisible for the internauts but visible by robots. This type of practice is mostly short-circuited or even punished by the modern robots, which undertake a black-list of the guilty site.

See “Indexation Robot”.

Number of visits of a Website over given period.

Abbreviation of Uniform Resource Locator, the address of documents and other available means on the Web. In example: http: // www.exemple.com, the first part of the address (http: // for HyperText Transfer Protocol) points out the protocol to be used by the navigator, the second corresponds in the name of domain where is the resource (www.exemple.com / exemple.htm present on the World Wide Web, literally the « big worldwide Web » refers to the page available "Exemple.htm" on the name of very domain " exemple.com”).

Technique consisting of rewriting by the web server under a form simplified of complex URLs. Often used to ameliorate the reference of the dynamic pages of which URLs is made up of variables, he allows a better catch in consideration (and therefore a better reference) of the page by robots. Eg: « exemple.php? Cat=1&produit=12.php » can be transformed into "Exemple_1_12.html" in the navigator.

See “Indexation Robot”.

See “Advertising Positioning”.