I need some help understanding Fluther -- "discussion" vs "chat"?

I noticed that when I post a question, I can make it a question or a discussion. I’ve posted a few questions as “discussions” because I thought it would be a good way of people sharing experiences and discussing each other’s experiences, but they keep getting pulled by the moderators and I’m told to take it to the chat room. What is the difference between a discussion and a chat?