Explain the Page Object Model and its benefits. Are there any downsides?

What the interviewer wants to hear

• A class per page or component holding locators and actions
• Tests call meaningful methods instead of raw locators
• Changes fixed in one place, less duplication
• Downside: can grow into huge classes; avoid assertions inside page objects
• Component objects for shared widgets

Model answer

The Page Object Model creates a class for each page or major component. The class holds the locators and exposes actions with clear names, such as loginPage.login(email, password) or cartPage.removeItem(name). Tests use these methods, so they read like user steps and do not contain raw selectors. The big benefit is maintenance: when the login form changes, I update one page object instead of 50 tests. It also reduces duplication and makes onboarding easier. The downsides are that page objects can become huge "god classes" if a page is complex, so I split them into component objects, like Header or ProductCard. I usually keep assertions in tests rather than page objects, so the page object stays reusable. Some teams prefer lighter patterns like fixtures or the screenplay pattern, but POM is a good default.

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