Windows updates are released frequently to enhance performance, improve compatibility, fix bugs, and distribute critical security patches. Microsoft issues security updates every second Tuesday of the month, known as Patch Tuesday, which are cumulative, meaning the latest updates include all previous fixes. The Cybersecurity and Infrastructure Security Agency (CISA) issues warnings about vulnerabilities, and Microsoft maintains a security portal for documentation of these issues. Users on unsupported versions, like Windows 10 without Extended Security Updates (ESU), are at increased risk. In addition to security updates, Windows receives an annual feature update and occasional optional non-security updates that introduce new features and enhancements. An example is the Windows 11 February 2026 preview update, which added new features and improvements.