Microsoft Edge launched in 2015 as a replacement for the fading Internet Explorer. It initially used EdgeHTML which is a proprietary browser engine made by Microsoft. In 2019 the decision was made to the Blink engine which runs Chromium based browsers such as Chrome and Opera.
The switch over of regular Windows 7 and above users to the new Chromium version will now happen as part of the January updates (due to happen on January 15). This new version will support Chrome extensions that are ported over to the Microsoft Store and have some features exclusive to Microsoft such as access to Microsoft account access built in and PDF notes within the browser, among others.