A patch in software refers to a piece of code designed to update, fix, or improve a computer program or its supporting data. Patches are often used to address security vulnerabilities, fix bugs, or enhance functionality. They can be applied to various types of software, including operating systems, applications, and games. Patches can be released by software developers or vendors, and they may come in different forms, such as minor updates or major revisions. Regularly applying patches is essential for maintaining system security and performance, as it helps protect against potential threats and ensures that software runs smoothly.