BBS forum is mainly used to exchange opinions on the Internet. Some people put forward a question or opinion, and others can put forward their own ideas and express their opinions on different aspects. But in order to ensure the security of the forum, not everyone can post and reply to the post. You must log in to the system as a member before you can post and reply to the post. Therefore, BBS forum divides users into four categories: ordinary tourists, ordinary members, moderators and administrators.