This is a sort of testing performed by users, customers, or other authorized entities in order to determine application/software requirements and business processes. Acceptance testing is the most crucial phase of testing since it determines whether or not the client approves the application/software.
Acceptance testing includes alpha and beta testing. Internal alpha tests are used to identify any obvious flaws, whereas beta testing is an external pilot test of a product before it goes into commercial production.
Examine product needs and identify critical deliverables.
Determine the timing and format of end-user testing.
Form a UAT team and recruit users.
Set up end-user testing tools and recruit testers.
An acceptance test can be thought of as a technique to determine whether or not a previously defined "contract" between the developer and the client is still in effect. Running those acceptance tests also assures that no requirement changes have occurred in the interim and that everything is in order to satisfy the customer.
UAT ensures that software can handle real-world tasks and perform to development criteria. Users are given the opportunity to engage with the software prior to its official release to check if any features have been ignored or if any flaws exist.