https://www.bleepingcomputer.com/news/microsoft/how-to-download-the-latest-windows-11-iso-from-microsoft/

Microsoft has officially released Windows 11 and ISO images that allow you to create bootable media to perform clean installs of the operating system and troubleshoot bugs and problems.

If you are not familiar with ISO images, they are a sector-by-sector copy of a DVD into a disk image file that you can save on your computer. These ISO images can then be used to create bootable media, such as a bootable USB drive, or mounted directly as a drive letter in Windows.