TYPO3 has a huge list of features—too many to fully list here; the full list can be found on the TYPO3 website http://typo3.com/Feature_list.1243.0.html.
Naturally with TYPO3 being a content management system, this is where most of its features lie:
Create, edit, and manage web pages
Create, edit, and manage individual content items
A clipboard to copy pages and elements to, in order to paste into different sections later
Versioning to control changes, and multiple changes
Workspace and drafts, to create drafts of pages that don't take effect until ready
Time-controlled pages and content, i.e. content and pages that are only active between a start date and an end date