What are Acceptance Criteria?

Acceptance criteria are a set of conditions that software must meet in order to be accepted by a customer or stakeholder.

And how are these conditions decided?
It’s all up to the product owner. They need to determine whether the feature is doing what the users want it to do (user story).

What are Acceptance Tests?

Acceptance Test usually run after the software has been developed. An acceptance test ensures that a software feature is working correctly and meets the acceptance criteria.