[@chrishajer Participant 15 years, 8 months ago]

Here’s my take on it, but I’m no guru.

• A topic is a collection of posts.
• A post is a single entry related to a topic. A post is also referred to as a reply.
• A discussion is a topic (I believe the two are synonymous.)
• A thread on some boards is a topic on bbPress.
• A forum is a collection of topics related to a subject.
• A bbPress installation can be a group of forums.