What types of testing must be necessarily conducted before releasing the product into the production environment?

Before releasing a product into production, it is essential to conduct the following types of testing:

• Functional testing — verifying that all functions work according to requirements.
• Regression testing — ensuring that new changes do not break existing functionality.
• Integration testing — checking the interaction between modules and components.
• Performance testing — assessing speed, responsiveness, and stability under load.
• Security testing — identifying vulnerabilities and data protection.
• UI testing — verifying usability and correct display.

Depending on the project, other types of testing may be added, but these are fundamental for a stable and secure release.