What types of software testing exist?

There are many types of software testing, the main ones are:

• Functional Testing — verifying that the functionality meets the requirements.
• Non-functional Testing — testing performance, security, usability, etc.
• Unit Testing — testing individual components or functions.
• Integration Testing — checking the interaction between modules.
• System Testing — testing the entire system as a whole.
• Acceptance Testing — verifying the product's readiness for use by the customer.
• Regression Testing — ensuring that changes haven't broken existing functionality.
• Performance Testing — load testing, stress testing.
• Security Testing — checking for vulnerabilities.

Each type aims to verify different aspects of software quality.