Test Automation platforms execute functional tests against applications without manual intervention — unit tests, integration tests, end-to-end (E2E) tests, visual regression tests, mobile tests, API contract tests. Core capabilities include cross-browser and cross-platform test execution, flake detection and retry strategies, parallel test execution, test artifacts (screenshots, videos, traces) for failure diagnosis, visual-regression comparison, cloud-hosted device and browser grids, and CI/CD integration. The category includes OSS test frameworks used alongside hosted grids (Playwright, Cypress, Selenium, Puppeteer, Appium) and commercial platforms with low-code authoring (mabl, Testim, Katalon, Sauce Labs, BrowserStack).