After Effects is, at its very heart, a compositing application and so After Effects comes with a bunch of compositing tools.

Compositing is the process of physically or digitally combining two or more images into one. Here's a brief helicopter overview of one of the most fundamental techniques used in post-production.

Red Giant today announced VFX Suite, an all-new suite of keying, tracking, cleanup and visual effects compositing tools, all right inside Adobe® After Effects®, part of Adobe Creative Cloud®.