Test data are sets of inputs or information used to verify the correctness, performance, and reliability of software systems.
[1] Test data may be used to verify that a given set of inputs to a function produces an expected result.
Alternatively, data can be used to challenge the program's ability to handle unusual, extreme, exceptional, or unexpected inputs.
[5] Due to privacy regulations such as GDPR, PCI, and the HIPAA, the use of privacy-sensitive personal data for testing is restricted.
While synthetic data can offer significant advantages, such as enhanced privacy and flexibility, it also comes with limitations.