SEO glossary

SEO glossary


The .htaccess file is a Linux configuration file for a web server. It is the file that helps the web server to set up traffic using the Http protocol. It is a very important element for optimising urls for SEO purposes.

Redirection 301:

A 301 redirect is an error code indicating that content has been transferred from one URL to another. This is particularly common when a website is migrated. The 301 redirect allows search engines to adapt the indexing of your content when the error is detected. In this way, search engines will no longer analyse the old url, which is now empty for the website’s referencing.

The 404 error:

When a url is requested in a browser but does not exist, or has been deleted or modified, the 404 error code is returned. Since this is a recurring error, it is useful to build a custom 404 page for a quality user experience.


These are all the links pointing to a website from outside (other websites, social networks, forums, etc.).


The baseline is the slogan that accompanies the name of a website. It is often displayed next to the logo in the navigation menu. It provides short, simple information about the site’s activity, as well as having a marketing dimension.

Deep link:

All links that redirect to something other than the home page of a website.

Doorway page:

All the pages whose purpose is to automatically redirect the web user to other content. It is often used as the primary page of a multi-site or when certain web pages are loaded.


Once a page has been analysed by the search engines, it is indexed. In other words, it is classified and sorted according to its content, relevance and other factors.

Internal link density:

This is a technical indicator that provides information on the density of internal links within a website.


The KEY (Keyword Effectiveness Index) is the analysis value corresponding to the frequency of online searches for a keyword divided by the number of results available.

Keyphrase density:

This is a technical indicator that corresponds to the density of presence of a phrase or word within online content.


A keyword is a word or phrase on which you want to position your content when it is searched for on search engines.

The alt attribute:

The alt attribute is a descriptive text that replaces a visual, such as an image or video. It is very useful for understanding the associated content for SEO algorithms, but also for people using assistive reading software. It is also the element displayed by default when pages on a website do not load correctly.

The craw:

Crawling is simply the action of exploring web content. Crawlers are search engine robots that come and study the content of a website.

Anchor links:

These are links for browsing the same page. By clicking on one of them, the browser redirects to a specific section of the current page.

Organic links:

Organic links are links that are spontaneously shared by Internet users who like the content. Typical examples are posts on social networks or shares on blogs and forums.

Link bait:

Link bait refers to a link to content that is intended to be shared en masse.

Link farm:

A link farm is a type of site dedicated to publishing links to optimise SEO. It is a dangerous technique that search engines disapprove of, but it was used for a long time in the early days of online SEO.

Long tail:

A long-tail keyword is one that is made up of several words, such as a phrase, in order to benefit from less competition.


The term encompasses all data dealing with data. This is information that must be entered to help search engines analyse online content.


The nofollow attribute applied to links informs search engine algorithms not to visit the link that follows.

off-site SEO:

This covers all practices designed to optimise a site’s SEO outside the site itself (e.g. netlinking strategy, social network communication, etc.).

on-page SEO:

Gathering of SEO practices specific to each page of a website (e.g. setting up metadata, keyword placement, etc.).

on-site SEO:

A set of optimisation techniques implemented within the architecture of a website (e.g. database optimisation, loading time optimisation, etc.).


Instruction document for search engine algorithms.


SEA (search engine advertising) covers all the commercial techniques used to obtain so-called unnatural visibility on a website. These are all paid referencing techniques.

SEF Url:

(Search Engine Friendly) is the classification of links that use words rather than random strings or numbers. It is a part of SEO that focuses on optimising links for keywords defined in the SEO strategy.


SEM (Search Engine Marketing) is the discipline that encompasses SEO as well as marketing and social networking strategies aimed at increasing traffic to a website.

SEO white hat

Gathers together all the recommendations and practices validated by Google and the other search engines to increase your traffic.

SEO Black hat

This group includes all SEO techniques involving manipulation of search engine vulnerabilities and other non-recommendable tricks. These practices are often frowned upon and blocked in future search engine updates.


SMO (Social Media Optimization) is the discipline of working on your social network strategy to boost traffic to your online website.

Canonical Url:

Groups together all urls respecting a specific naming, for example the fact that www is present on each url on the internet is a canonical rule.


UX (User Experience) is a field of web development that brings together the knowledge and techniques needed to create an interface that respects the user experience.

XML sitemap:

The XML sitemap is simply the navigation map of a website. It makes it easier for search engine algorithms to read the site. It is a document that is not visible to Internet users. An alternative way of presenting the map of a website to Internet users is the Html sitemap.

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Maxime Macé

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