Test automation is the practice of using tools and scripts to execute tests automatically, ensuring consistent validation of software functionality across builds and environments. It helps teams reduce manual effort and maintain quality as development velocity increases.

By automating repetitive and high-impact test scenarios, teams can run regression checks quickly and receive fast feedback on code changes. Test automation is especially valuable in CI pipelines, where early detection of defects supports continuous integration and delivery.

Successful test automation depends on selecting the right tests to automate and maintaining them over time. Stable workflows and critical functionality provide the greatest return, while exploratory and frequently changing areas are better suited for manual testing.

When combined with sound test design and manual validation, test automation enables teams to scale testing efforts, reduce risk, and deliver reliable software releases with confidence.