https://www.bleepingcomputer.com/news/microsoft/windows-11-wont-work-without-a-tpm-what-you-need-to-know/

Windows 11 requires a TPM security processor to install or upgrade to Windows 11. Unfortunately, there has been a lot of confusion about what type of TPM you need and why you need it in the first place.

Today, Microsoft announced the system requirements to upgrade or install Windows 11 and included a new PC Health Check tool that you can use to check if your hardware is compatible with Windows 11.