Difference between acceptance test and functional test?

Question

What is the real difference between acceptance tests and functional tests?

What are the highlights or aims of each? Everywhere I read they are ambiguously similar.

Answer 1

Acceptance testing is just testing carried out by the client, and includes other kinds of testing:

• Functional testing: "this button doesn't work"
• Non-functional testing: "this page works but is too slow"

For functional testing vs non-functional testing (their subtypes) - see my answer to this SO question.