Library
A library contains multiple events and projects in the same location. Media that
you import into a specific library is stored inside the library.
Event
When you import video, audio, and still images, or record directly into Final Cut
Pro, the source media files (your raw footage) are stored in events.
Project
A project provides a record of your editing decisions and the media you use. You
build your project by adding clips and editing them in the Timeline.
, Viewer
When you play clips selected in the Browser and the Timeline, they appear in the
Viewer.
Browser
This displays the clips and projects for the item selected in the Libraries list. You
select clips or portions of clips to work with them.