What is Selenium Grid used for?
Options
- Running tests in parallel across many machines (Correct option)
- Drawing tables of results for the test reports
- Managing the databases that tests rely upon
- Compiling the Java code of the test project
Answer
Running tests in parallel across many browsers, versions and machines (or containers)
Why
One machine running tests one by one makes a big UI suite slow. Selenium Grid has a hub/router and several nodes; tests ask for a browser (Chrome 120 on Linux) and the Grid sends them to a free node, running many in parallel.
Typically deployed with Docker or Kubernetes, or replaced by cloud services (BrowserStack, Sauce Labs).
Parallel tests must be independent: separate data, no shared state.
Remember
Grid = parallel, cross-browser execution.