Update Classifications

Critical updates : Broadly released fixes for specific problems addressing critical, non-security related bugs.

Definition Updates: Updates to anti-malware or other definition files.

Feature Packs: New product functionality usually included in the next full product release.

Security Updates: Broadly released fixes for specific products, addressing security issues.

Service Packs: Cumulative sets of all hotfixes, security updates, critical updates, and updates created since the release of the product. Service packs might also contain a limited number of customer-requested design changes or features.

Tools: Utilities or features that aid in accomplishing a task or set of tasks.

Update Rollups: Cumulative sets of hotfixes, security updates, critical updates, and updates packaged together for easy deployment. A rollup generally targets a specific area, such as security, or a specific component, such as Internet Information Services (IIS).

Updates:  Broadly released fixes for specific problems addressing non-critical, non-security related bugs.