https://mix.office.com/Home/SetupSnip

Communicate your idea in 3 easy steps or less:

Snip It: Click and drag to capture any window or area of your screen, and you’re done!
Annotate It: Or, narrate your comments and draw on your snip with digital ink.
Share It: Paste your snip, send it as a URL, or save it as an MP4 video.