A software upgrade is the process of replacing an older version of a software program with a newer one. This can include improvements in features, performance, and security. Upgrades are often released by software developers to fix bugs, enhance user experience, or add new functionalities. Users typically receive notifications about available upgrades and can choose to install them. Upgrading software is important for maintaining compatibility with other systems and ensuring that the software remains secure against vulnerabilities. Regular upgrades help keep applications like web browsers, operating systems, and mobile apps running smoothly.