What is media creation tool?
If you need to install or reinstall Windows 10 using a USB or DVD, you can use the media creation tool below to create your own installation media with either a USB flash drive or a DVD. The tool provides file formats optimised for download speed and can be used to create ISO files.
Windows 10 ISO - Microsoft
https://www.microsoft.com/en-in/software-download/windows10ISO
Search for: What is media creation tool?