The Acumen software design blog provides you with helpful articles about Apache.

Several web sites provide a good overview.

Official Apache Overview

Apache Wikipedia

HOWTO: Configure Magento Cron

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Our ecommerce team was having trouble with Magento cron jobs, so we researched the various mechanisms to test and debug them.  The jobs did not run at the expected time and we couldn't see why. The Magento cron jobs run as apache. …