All students have the Chrome extension Screencastify that allows them to record themselves (audio or video) while using any website. It saves into their Google Drive account.
https://www.screencastify.com/education/
50 Ways to Use Screencastify in Your Classroom (pdf ebook)
For instance, they can record themselves going through a Google Slide presentation and share it with their teachers and classmates. Or, talking through how to solve a problem. This is great for practicing foreign languages, too.
Students activate the tool by clicking on the red arrow in their Chrome toolbar.
Teachers will need to install it via the Chrome Web Store