What exactly does subscribed threads mean?

Don’t know where to put this thread so I put here.

I look in user cp and see like 7 subscribed threads. What do they mean?

Topics you have posted in, it subscirbes you to them…

When someone replies to the thread you’re subscribed to they e-mail the thread to you.

Oh my god, for TotalBF2, these Battlefield 2 forums, when ever you post in a topic, and someone replies, it e-mails it to your email. I have about 30 unread messages.