Acceptance testing is a crucial software testing methodology that verifies whether an application meets defined business and functional requirements before its release. It involves various types of testing, including User Acceptance Testing (UAT), Operational Acceptance Testing (OAT), contract acceptance testing, and regulatory compliance testing, all designed to ensure the application is reliable, secure, and compliant with industry and regulatory standards. This process involves stakeholders collaboratively defining acceptance criteria, executing both manual and automated tests, and analyzing results to confirm the application meets these criteria. Acceptance testing enhances software quality by aligning development goals with business requirements, improving user satisfaction, and reducing post-deployment issues. The integration of Continuous Integration and Continuous Delivery (CI/CD) into acceptance testing further streamlines the process, enabling automated testing and accelerating feedback and iteration cycles, ensuring that the software is always in a ready-to-release state.