File abstraction layer (FAL)
TYPO3 has a file abstraction layer (FAL) integrated which abstracts technical details (where the file is stored) and allows to work with different storage forms.
FAL also allows the editors to manage meta data that can be displayed wherever an asset is displayed. The metadata can also be used for copyright notices.
Working with multi media: Digital asset management
Multi media assets (images, videos, audio, etc) are usually stored as files on the server. Especially videos are frequently displayed from third-party sources such as Youtube or Vimeo.
In TYPO3 you can manage all assets in the backend module File > Filelist if you have sufficient permissions. See chapter Managing files in the TYPO3 CMS.