The category that handles bug fixes and simple changes is minor. A minor release is a type of release that introduces small enhancements or fixes to existing functionality, such as correcting spelling errors or improving performance. A minor release usually has a low impact on users and does not require extensive testing or training. A patch release is a type of release that addresses critical issues or defects that affect the functionality or security of an application, such as fixing broken links or resolving vulnerabilities. A patch release usually has a high impact on users and requires immediate deployment. A major release is a type of release that introduces new functionality or features to an application, such as adding new objects or components or changing business processes. A major release usually has a high impact on users and requires extensive testing and training. A rollback is not a type of release, but an action that reverses a release that has been deployed to an environment, such as undoing changes or restoring previous versions. A rollback may be necessary if a release causes errors or issues that affect the functionality or performance of an application.