Screencastify is an extension to the Google Chrome browser that lets you very quickly and simply record what's going on in either a single 'Tab' or your complete desktop, including audio.
The extension itself is very easy to use and there aren't a lot of options to configure. Once installed you simply click the extension icon and click record. Once you have finished you can click stop.
Once you have recorded your video it stores the video locally within the extension, here you can choose to download it for further editing or, and this is a major bonus, upload directly into your YouTube.
We have tested a few screencasts with this and are happy with the results. You can even present from Google Slides or PowerPoint and as long as your record the 'Desktop' you will record the presentation and of course any audio voice over that accompanies it. This has the potential to replace the use of Debut here at UCS as the primary method of recording the screen, we will be in discussions with IT Services here to investigate the options.
If you use Google Chrome and would like to use Screencastify you can install the extension from Chrome's Web Store - Screencastify on Google Web Store