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Selenium is an open-source tool for automating web browsers supporting many browsers across many platforms. It is widely used in test automation, but it is not limited only to testing. Selenium WebDriver is a collection of language-specific bindings to drive a browser natively. The supported languages include J**ava, C#, Kotlin, Python, Ruby, JavaScript, Perl, and PHP**. Selenium can only automate webpages** but you cannot automate native apps, for that purpose you can use Appium.