After Effects templates are pre-made animation sequences, made using the special effects software Adobe After Effects. The templates are available as .zip files, which require a program such as WinRAR (Windows) or Archive Utility (Mac) to extract. Once unzipped, you can open and edit the .aep file in Adobe After Effects. The .zip file also includes a ReadMe with instructions on how to change the text/logo/footage/images in the template.

See: What are Adobe After Effects Templates and How to Use Them

See: Adobe After Effects vs. Premiere Pro – Which Program Should You Use?