Windows Update is a built-in feature of the Windows operating system that helps keep your computer secure and up to date. It automatically downloads and installs updates, which can include security patches, bug fixes, and new features. This process helps protect your device from vulnerabilities and improves overall performance. Users can customize their Windows Update settings to choose when updates are installed and whether to receive updates automatically. Regularly updating your system is important for maintaining compatibility with software and hardware, ensuring a smooth and efficient computing experience.