Testing / Selenium Interview questions

What is the purpose of Selenium Grid?

Selenium Grid distributes test execution across multiple machines and browser/OS combinations, so a suite can run in parallel remotely instead of sequentially on one local machine.

WebDriver driver = new RemoteWebDriver(
    new URL("http://grid-hub:4444"),
    new ChromeOptions()
);

A test written against RemoteWebDriver doesn't need to know which physical machine or browser version actually executes it - the Grid routes the session to an available matching node based on the requested capabilities. This makes it central to cross-browser testing at scale (running the same suite against Chrome, Firefox, and Safari simultaneously) and to CI setups that need more parallel capacity than a single build agent provides.

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Selenium Grid is primarily used to: Write test assertions

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Distribute test execution across machines/browsers in parallel

✓ Correct! Well done.

Record test scripts visually

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A test using RemoteWebDriver against a Grid: Must hardcode the exact physical machine to use

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Doesn't need to know which node executes it

✓ Correct! Well done.

Cannot request specific browser capabilities

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