Simply put, it is an activator.
Therefore, activation is a must, and Microsoft Toolkit makes it easier.
Features and Highlights
Microsoft Toolkit is a portable software.

This means anyone can use it immediately without having to install it first.
Its small size allows even those who suffer from slow internet connection to download it quickly.
The Main tab contains information about the currently installed Windows such as the version number and product edition.

In the Product Keys tab, you’re free to install or remove a product key.
This window can find the keys from two sources: the Windows clipboard or a selected file.
Microsoft Toolkit Free Download for Windows
There are more tools and functions available in Microsoft Toolkit.