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A forum is a community where users can become members and post messages for other members to read or respond to. Forums are written in many different programming languages and are free to use most of the time. Forums are a great way to add a community to a web site.

Comparison with other web applications

One significant difference between forums and electronic mailing lists is that mailing lists automatically deliver new messages to the subscriber, while forums require the member to visit the website, and check for new posts. Due to the possibility of members missing replies to threads they are interested in, many modern forums offer an "e-mail notification" feature, where an e-mail is automatically sent to all users who have chosen to be notified of new replies, informing them that a new post has been made, and RSS feeds that allow people to see the summary of the new posts using an aggregator software.

The main difference between newsgroups and forums is that additional software is usually required to participate in newsgroups, a newsreader. Visiting and participating in forums normally requires no additional software beyond the web browser.

Forums, unlike wikis, do not allow people to edit other's messages. Some users, however, may be given this ability in order to moderate content (for example, if spam is posted to the forum).

Unlike blogs, forums typically allow anyone to start a new discussion (known as a thread), or reply to an existing thread. The range of topics discussed on forums is typically wider—as a website running forum software may have more than one forum, each dedicated to a different topic. While many blogs allow visitors to post comments in reply, the number of people who can create entries is normally very limited, and the range of viewpoints and beliefs on a blog are also limited.

Forums differ from chat rooms and instant messaging because forum participants do not have to be online at the same time; forums also usually deal with one topic and personal exchanges are typically discouraged. Participants in Internet forums should realize that what they have to say will be public knowledge for years to come. For example, Google Groups (formerly DejaNews) includes an archive of Usenet articles dating back to 1981. Forum archives are sometimes the best way to find an answer to very obscure questions, such as how to fix a particular computer problem.

Western-style forum software places a heavy amount of emphasis on identity, with user registration, custom titles and avatars being standard features. This makes the tone of discussion very different from the more anonymous 2channel style boards; the burdens of status and persona encourage, alternately, highly formal discourse and close personal relationships. The behaviour of moderators shapes overall tendencies towards one direction or the other.