Comparison With Other Web Applications
Electronic mailing lists: The main difference between forums and electronic mailing lists is that mailing lists automatically deliver new messages to the subscriber, while forums require the reader to visit the website and check for new posts. Because members may miss replies in threads they are interested in, many modern forums offer an "e-mail notification" feature, whereby members can choose to be notified of new posts in a thread, and web feeds that allow members to see a summary of the new posts using aggregator software. There are also software products that combine forum and mailing list features, i.e. posting and reading via email as well as the browser depending on the member's choice.
Newsreader: The main difference between newsgroups and forums is that additional software, a News client, is required to participate in newsgroups whereas using a forum requires no additional software beyond the web browser.
Wiki: Unlike conventional forums, the original wikis allowed all users to edit all content (including each other's messages). This level of content manipulation is reserved for moderators or administrators on most forums. Wikis also allow the creation of other content outside the talk pages. On the other hand, weblogs and generic content management systems tend to be locked down to the point where only a few select users can post blog entries, although many allow other users to comment upon them. It should be noted that the Wiki hosting site known as Wikia has two features in operation, known as the Forum and Message Wall. The forum is used solely for discussion and works through editing, while the message wall works through posted messages more similar to a traditional forum.
Chat rooms and instant messaging: Forums differ from chats and instant messaging in that forum participants do not have to be online simultaneously to receive or send messages. Messages posted to a forum are publicly available for some time even if the forum or thread is closed, which is uncommon in chat rooms that maintain frequent activity.
One rarity among forums is the ability to create a picture album. Forum participants may upload personal pictures onto the site and add descriptions to the pictures. Pictures may be in the same format as posting threads, and contain the same options such as "Report Post" and "Reply to Post".
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