Windows Check Disk is a built-in utility in the Windows operating system that scans and repairs file system errors on a hard drive. It helps identify issues such as bad sectors, lost clusters, and directory errors, ensuring that your data remains safe and accessible. To use Check Disk, you can run it through the command prompt or by right-clicking on a drive in File Explorer and selecting "Properties." From there, you can access the "Tools" tab and click on "Check" to initiate the scan. This process can help maintain the overall health of your computer's storage.