Windows 7 Updates - Important versus Optional

Can someone point me to a good source for information on what the difference is between important and optional updates?

I don't mind non-MS sites.  So long as they're reliable.
brothertruffle880Asked:
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WayneATaylorCommented:
Important are normally security or other system critical fixes that affect safety and stability, whereas Optional are normally additional programs that you might want to install, things like .NET/Skype etc etc

Wayne
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Justin DurrantSr. Engineer - Windows Server/VirtualizationCommented:
Updates are classified as Important, Recommended, Optional, and Featured. Here's what they mean:

Important updates offer significant benefits, such as improved security, privacy, and reliability. They should be installed as they become available, and can be installed automatically with Windows Update.

Recommended updates address non-critical problems or help enhance your computing experience. While these updates do not address fundamental issues with your computer or Windows software, they can offer meaningful improvements. These can be installed automatically.

Optional updates can include updates, drivers, or new software from Microsoft to enhance your computing experience. You can only install these manually.

Depending on the type of update, Windows Update can deliver the following:

Security updates. A broadly released fix for a product-specific security-related vulnerability. Security vulnerabilities are rated based on their severity, which is indicated in the Microsoft security bulletin as critical, important, moderate, or low.

Critical updates. A broadly released fix for a specific problem addressing a critical, non-security related bug.

Service Packs. A tested, cumulative set of hotfixes, security updates, critical updates, and updates, as well as additional fixes for problems found internally since the release of the product. Service Packs might also contain a limited number of customer-requested design changes or features.
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WayneATaylorCommented:
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brothertruffle880Author Commented:
Great  insight.  Thanks!!!!
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