iMovie is one of the most commonly used video editing programs for Apple Mac users, running on the macOS and classic Mac OS operating systems. It's developed by Apple and has a history dating back to 1999, and one of the main uses of this software is to add iMovie video effects to video clips. Users can modify colors, crop video files, rotate them, and stabilize them, and there are many other cool iMovie effects and filters for iMovie to try out. If you're a new user, this guide will cover how to add special effects in iMovie.