In backlog management, what does the term "acceptance criteria" refer to?

In backlog management, "acceptance criteria" refers to the conditions that a product must satisfy to be accepted by the product owner. These criteria define the functional and non-functional requirements that must be met for a user story to be considered complete and ready for delivery. By establishing clear acceptance criteria, the team and the product owner align their understanding of what constitutes a successful implementation, ensuring that the delivered product meets stakeholder expectations and adds value to the end-users.