The ease of classroom management in edpuzzle makes it an essential tool for teachers.

EdPuzzle lets you add questions to an existing video; the viewer must answer before the video will resume. One great feature is that you can set the playback to disable skipping ahead.

I like that EdPuzzle allows me to assign my students videos to watch, and it tracks if they have watched the video. I can also insert questions throughout the video to check their understanding.