The primary purpose of AnimGet (or Animation Get) is to extract animation frames for use in RPG Maker (or other animation programs). When activated, it will work in the background, taking snapshots every 10 milliseconds, which can then be rendered in a suitable graphics program, such as Paint Shop Pro.
In the beginning, AnimGet was used in conjunction with various emulators, particularly the NES or SNES ones, to capture sprite or battle animations. These could then be rendered and ported into RM2K/3 for use in games. Copyrights were flouted in those days, but that didn’t stop the mass productions of RM2K/3 made Final Fantasy or Zelda fan games!
A much more up-to-date (and perhaps ethical) use for AnimGet is to create still-frame images for animations for tutorials or mini movie clips. But, since the program runs in the background, snapshotting every 10 milliseconds, whatever you do while it is active will be logged.