Forum is an online discussion group, where participants with common interests exchange information.
In simple words: Forum is a place where you Ask Your Questions and Answer Others' Questions.
Other definitions*:
I. The public square or marketplace of an ancient Roman city that was the assembly place for judicial activity and public business.
II. A public meeting place for open discussion.
III. A medium of open discussion or voicing of ideas, such as a newspaper or a radio or television program.
* The American HeritageŽ Dictionary
