Selenium is a wonderful library. It supports all major browsers, has all the features we will probably need and is currently the de-facto standard in browser tests today, and rightfully so.
(For those that don’t know, browser tests are tests that run a browser, automate the browser to interact with your frontend application, and test it that way.)
Selenium has bindings for lots of languages — Java, C#, Python, Ruby, and others. This is great — you can use your favorite language to write your tests in.