Windows patch management is the process of managing patches for Windows. It includes getting software and security updates, testing and installing these updates. Those updates are necessary for running applications, drivers and operating systems in your IT environment.
Windows Patches are a set of changes to a Windows operating system or its supporting data which are designed to update, fix or improve your operating system, which also includes fixing security vulnerabilities.
Although patches are meant to fix problems, they can sometimes introduce new problems, and in some special cases, they may even break the functionality of a device or disable a device, for instance, by removing components for which the update provider is no longer licensed.