What is UI test automation?

UI test automation drives the application the way a user would - clicks, typing, navigation - and asserts visible outcomes in the browser or mobile shell. Scripts or recorded flows replace repetitive manual checks on critical journeys. Unlike unit tests, UI automation exercises integrated layers: frontend, APIs, auth, and third-party widgets. It is slower and flakier than lower-level tests, so teams typically automate stable, high-value paths and keep a balanced pyramid. Modern tools include code frameworks (Playwright, Cypress) and no-code record-and-replay options for teams without dedicated automation engineers. Maintenance - selectors, test data, environments - is the long-term cost to plan for.