What types of testing need to be performed before product release?

Before releasing a product, several types of testing should be performed to ensure quality and stability:

• Functional testing — checking that all functions work according to requirements.
• Regression testing — ensuring that new changes haven't broken existing functionality.
• Performance testing — assessing speed and stability under load.
• Security testing — checking for vulnerabilities and data protection.
• Usability testing — evaluating user interface convenience.
• Cross-browser and cross-platform testing — verifying operation on different devices and browsers.
• Compatibility testing — checking interaction with other systems and software versions.

The list can be expanded depending on the product and requirements, but these are the basic types for releasing a quality product.