Threads:
A discussion forum is hierarchical or tree-like in structure: a forum can contain a number of subforums, each of which may have several topics. Within a forum's topic,
each new discussion started is called a thread and can be replied to by as many people as so wish.
Posts:
A
post is a user-submitted message enclosed into a block containing the user's details and the date and time it was submitted. Members are usually allowed to edit or delete their own posts.
Posts are contained in threads.
Source:
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