A patch is a software update provided by developers or vendors to fix security vulnerabilities, bugs, or other issues in a program or operating system. Patches are essential for maintaining the security and stability of digital devices, as they address flaws that could be exploited by cybercriminals. Installing patches promptly helps protect systems from malware, data breaches, and other cyber threats. Patches may also introduce minor improvements or new features, but their primary purpose is to correct problems and enhance security.