Testing techniques are methods used to evaluate the functionality and performance of software applications. These techniques help identify bugs and ensure that the software meets specified requirements. Common testing techniques include unit testing, where individual components are tested in isolation, and integration testing, which assesses how different components work together. Another important technique is system testing, which evaluates the complete and integrated software system to ensure it behaves as expected. Additionally, user acceptance testing involves real users testing the software to confirm it meets their needs. Each technique plays a crucial role in delivering high-quality software products.