Selenium is a portable software testing framework that is being used for testing web applications. It is being used for automating test cases with the use of programming languages, which include Ruby, Scala, Perl, Java, PHP, etc. These tests can be used to execute against different web browsers.

Selenium includes a few components, and each of these has a separate function to perform the development of applications test automation. Some of the most common elements are Selenium IDE, Selenium RC, Selenium WebDriver, and Selenium Grid.

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