External optimisation is building up link mass, i.e. getting links to your site from other resources.
In conditions of toughening the fight of search engines with links, the main problem is the selection of a good donor site. The best result gives links from trusted thematic unspammed sites.
In the process of external optimisation a list of "donors" is formed, the texts of links and link environment are developed and then they are placed.
To build up a natural and high-quality link mass, use methods of obtaining links that do not contradict the rules, for example:
AVSEO can help you promote your website.