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Cache expiration in Drupal 7

On admin/config/development/performance

Minimum cache lifetime
Cached pages will not be re-created until at least this much time has elapsed.
Expiration of cached pages
The maximum time an external cache can use an old version of a page.

What exactly does each mean?

This is quite a major point of confusion for Drupal 6:

http://drupal.org/node/142242#comment-230669

Searched words: 
caching performance

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