Free For All (FFA) are link collections. These are websites with link lists
to other websites. The link lists are, as the name suggests, Free for All, i.e. free for everyone to use. The purpose of the link lists is to increase the link popularity of one's own website and thus improve the ranking
Free For All (FFA) is a rather questionable tool for search engine optimization (SEO), because the link entries can be set without any verification or quality statement. Search engines now recognize such FFA link collections and do not rank them, and if they do, the links present on them are penalized.