Acceptance criteria (AC) is the set of criteria that define / limit the functional scope of a Product Backlog Item. It guides how a particular feature may be used from an end user’s perspective. If the implementation of a functionality meets the Acceptance Criteria the Product Backlog Item (PBI) or a User Story would be accepted by the user, the customer, or the Product Owner.
Acceptance critieria for each PBI would be different and unique as it relates to the functional scope of that PBI.
Acceptance criteria is different from Definition of Done which focuses on Quality and Completeness. DoD is common across the PBIs and is consistent for the Product.
Refer for More: Tips to Write Effective Acceptance Criteria