The Media Creation Tool is a free utility provided by Microsoft that allows you to create installation media (a USB flash drive or DVD) for Windows 10 or Windows 11. This media can then be used to :

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Upgrade your current Windows installation:

This is a way to get the latest features and updates without a clean install.
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Perform a clean installation of Windows:

This completely wipes your hard drive and installs a fresh copy of Windows. Use this if you[SQ]re having significant problems with your current system.
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Install Windows on a new computer:

This is necessary when setting up a new PC.

Essentially, it simplifies the process of obtaining and preparing the Windows installation files. Instead of downloading an ISO file and burning it to a disc or creating a bootable USB yourself, the Media Creation Tool handles the entire process. You select your language, edition (Home, Pro, etc.), and architecture (32-bit or 64-bit), and the tool downloads the necessary files and creates the installation media for you.