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Definition
SEO is the set of techniques that allows a site to be listed in search engines or directories.
SEO is often associated with positioning, which represents the art of improving the site’s rank in the results provided by search engines.
You may also like : Free Web SEO - Books on Natural SEO
Challenges
SEO is one of the main sources of traffic generation for a site today. Indeed, it allows users to access a site without knowing its address.
The main influx comes from search engines, but many visitors also come through directories.
Further reading : Free SEO - Free SEO Tools and Software
Techniques
Definitions, stakes, and techniques of web SEO