A forum is a format for discussions (such as opinions) and Q&A (such as how-to) questions.

How is a forum different from other applications?

All of a forum's content is crowdsourced. This is different from a blog, whose material is authored by specified authors; from a wiki in that a wiki page's author is a permissioned person in the community and in a gallery, whose content is furnished by gallery owners. (The following capture is an example forum thread about coaching and "Dealing With Winning and Losing"