Here is a comprehensive list of the most important MyBB features:
Unlimited number of posts, threads and members.
Fulltext search capabilities (requires MySQL 4.1+ which is provided by default on all SiteGround servers).
Posibility for multiple forum instances in one database.
Fully customizable using the MyBB templates and theme system.
You can create different languages on your forum. Languages are fully customizable and can be adjusted according to your needs.
Intuitive and functional user control panel.
Custom profiles and and possibility to alter settings per user.
Custom profile fields can be added.
Private messaging system. Tracking and multiple folders functionality included by default.
Reputation system allowing members to rate each other.
Signatures, avatars, buddy and ignore lists, forum subscriptions and all basic forum functionality that is generally available.
Attach multiple files to a single post.
Automatic thumbnail generation for attached images.
Clickable smilies and BB Code.
Quick moderation options. New moderator tools with various options can be created.
Email notification of new posts.
Create polls with multiple options and attach them to threads.
Multi-quote - quote multiple posts easily in one reply.
Thread Display Features
Threaded or linear viewing modes.
View a printable version of any thread.
Subscribe to threads or add them to a favorite threads list.
Send threads to your friends via email.
Quick reply area - quickly respond to a thread or quote a reply.
Report posts to moderators.
Add moderators to particular forums, set their permissions or allow them to moderate all forums.
Extensive logging of all moderation activities performed.
Open, close, stick and unstick threads.
Move or copy threads between forums, merge threads together, split posts from a thread.
In-line moderation - mass action multiple threads or posts in one go.
Create your own moderation tools to perform multiple actions at once.
Moderator control panel allowing moderators to perform some light administrative tasks, such as announcement management, moderation queue management for the forums they moderate, and basic user profile editing.
Completely customize the look and feel of your forums by creating a color scheme and modifying templates.
Control every aspect of your forums with little technical knowledge. No programing expertise is required in order to fully manage your forum.
Assign permissions to forums and different user groups
Manage smilies, custom MyCode (create your own bb code tags for your forum), post icons, word filters etc.
Powerful user management features, including User Views, which are basically saved searches and allow you to track groups of users
Ban users by IP address, email address, username or create a timed ban on an account
Administrator permissions to limit the abilities of secondary administrators
Run maintenance tasks to keep your forum running in tip-top shape
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