WSUS: Update Classifications Explained...

I'm in the process of setting up A Software Update Point (SUP) with SCCM 2012. When I was settung up the "Update Classifications" portion I have to admit I was a little bit confused about what some of the classifications actually meant. I did a little digging, found what each one dies and I thought I'd post it here for reference:

• 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.

Hope this helps someone!