: These professionals take various elements—like raw footage, 3D renders, and animated text—and "compose" them into a final, seamless scene.
Depending on your specific focus, this typically refers to one of two major plugin suites designed to automate and enhance motion design workflows. 1. Animation Composer (by Mister Horse) ae composer
However, you may be looking for one of the following: ae composer
If your interest in "ae composer" relates to writing code inside After Effects: ae composer