Adobe Premiere is a non-linear digital video editor targeted at media production professionals and serious amateurs. User-created plug-ins can extend almost any area of functionality and their development is the most likely reason for this tag appearing on Stack Overflow.
Premiere is a full-featured video editor, initially released in 1991. It is roughly comparable to Apple's finalcut and Avid Studio which target video and cinema production professionals.
Premiere is one of seven core applications in the CreativeCloud for video editing, a total solution for media producers which includes photoshop, after-effects, SpeedGrade, Prelude (metadata ingest, logging and rough cuts), Audition (digital audio editor).
Premiere comes in two sizes, Premiere Elements—a very stripped-down non-file-compatible edition—and Premiere Pro, which has all available features.
Premiere has a plug-in architecture with an extensive library of plug-ins, both from Adobe and third party vendors, for video effects, audio effects, transitions, video file container format, codecs, display drivers, transcoders, 3D processing, etc. Many plug-ins are shareable with After Effects.
Resources: