FAQ: What is Windows Update?

Windows Update are essential software patches released by Microsoft to improve your operating system's security, performance, and functionality. You need them to keep your computer safe from vulnerabilities and ensure it runs smoothly.

For details, please see:
https://support.microsoft.com/en-us/windows/windows-update-faq-8a903416-6f45-0718-f5c7-375e92dddeb2