Who makes this links in forums?

[Rahuldev09]

I 've seen many forums with structure like that when I watch competitors backlinks:

Name of keywords
images
keywords
''
''
top ranking sites on that keywords
site link
site link
site link
then again keywords
keywords
keywords
then another forums sites
forum link
forum link
forumlink

I don't know what is this and who make this and for what pupose?

 

[Rahuldev09]

You can check out backlinks report of this page if you want know what exactly I am talking about:techylist.com/gta-san-andreas-apk-obb-download-direct-links/