Cross-linking is the process of linking one site to another site.
It provides users with reference sites that contain the content related to the search.
The 2 websites cross-linking do not be owned by the same person.
In other words, cross-linking is a barter wherein I link to you, and you link to me.
It could be a 2-way link or 3-way link. In a 2-way link site A links to site B and site B links to site A. In a 3-way link, site A links to site B, site B links to site C and site C links to site A.
