It is a chrome extension that allows you to record your screen or take a picture of your screen. Snagit allows you to make small little edits like adding circles or squares, and even text boxes on the screen to display a more precise explanations. You can highlight an important part of the video, etc. Snagit is available to use when your device is offline, so no internet is required to take pictures or record a video, though there is more options to record/take a picture of when you are online. Because it is an extension and requires no download process, it is very simple to use.