> For the complete documentation index, see [llms.txt](https://bharateeshd.gitbook.io/seleniumatoz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://bharateeshd.gitbook.io/seleniumatoz/selenium/what-is-testing-and-why/what-is-selenium-and-why.md).

# What is Selenium and Why?

Well if we have a basic knowledge of Java the you’ll be having an idea of what is a library or jar file. Libraries are pre-written Java code for specific purposes so that they can be included in a Java project whenever required.

 **Selenium** is one of such kinds of open source and insanely popular Library(s) where the code for automating a user interaction with a browser is pre written. So as soon as we add selenium libraries to our project we’ll be having all the features that we need to simulate the actions of a user on browser. 

As Selenium defines itself.,

> **Selenium automates browsers. That's it! What you do with that power is entirely up to you**

For more details head to Selenium’s website - [Selenium](https://www.seleniumhq.org/).