A Thread is a member of the Forum hierarchy. It goes like this:
- Specific Forum
Well, not exactly like that, but you get the picture.
Each thread is generally constrained to a single topic of discussion and going off topic is often considered rude. A thread is made up of a single introductory post that sets the topic of discussion and up to five hundred replies (after five hundred it is closed down because the site will slow down if the threads get too many posts.).