A test designed to prove that system behavior is acceptable to the target customer.

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Usually a large suite of tests are needed to prove complete acceptance, and so the suite is often called the Acceptance Test. Note that acceptance is outward directed, though they are used for inside testing too.

A good practice is to have the customer participate as much as possible in Acceptance Test design. This improves the chance of customer satisfaction if the test passes.

Tests can be automated or manual. Automate as many as you can. Examples of those hard to automate are usability, gorilla testing, usability, multiple hardware permutations, usability, installation, usability, security attack proof and usability. :-)

Use this religiously to be customer and quality oriented.