EDpuzzle is a free tool to let you add interactivity to online videos to help engage learners with the content rather than simply be passive viewers. You can select videos from a host of online hosts (including YouTube, Khan Academy and more) or ones you have uploaded yourself, crop the video to show only the part you are interested in showing to your learners. You can add your own audio, add a quiz or questions at specific points in the video, and as the teacher match the activity to the learner – you can even stop pupils jumping ahead on the video. The teacher sets up an account, gives the pupils a class code and the learning begins.
Here is a video which explains how EDpuzzle works: http://www.youtube.com/watch?v=iTQpvkQdQOw
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Here’s a link to the EDpuzzle YouTube channel with a host of videos showing how it can be used in an educational context.