What is test data management?

Test data management (TDM) is how teams create, store, refresh, and isolate data used in manual and automated testing. Reliable tests need predictable accounts, orders, subscriptions, or records - not shared production copies that change unpredictably. Strategies include synthetic data generators, anonymized production subsets, per-run database snapshots, and cleanup hooks after each test. Poor TDM causes flakes (colliding emails), false positives, and compliance risk when real PII leaks into lower environments. API setup steps often seed data before UI flows run. Treat test data as code: version fixtures, document dependencies, and reset state between runs. Investment in TDM pays off most when automation and parallel CI workers scale up.