On-topic
From Wikipedia, the free encyclopedia
A contribution is on-topic if it is within the bounds of the current discussion and off-topic if not. The terms are normally used in the context of mailing lists, discussion groups, discussion forums, bulletin boards, newsgroups, and wikis.
It is a common courtesy to mark a new off-topic posting or email by beginning it with "OT" - eg in a forum discussing the Linux operating system someone might post: "OT: Wow, did you feel that earthquake?".
The term "off topic" is sometimes used to indicate a discussion venue where "anything goes." That is, a place to discuss anything other than matters specifically addressed by the website in question. For example, an off topic category on an automobile related discussion forum may include talk about video games (which presumably have nothing to do with autos).