Selenium is the most popularly used freeware and open source automation tool. The benefits of Selenium for Test Automation are immense. Importantly, it enables record and playback for testing web applications and can run multiple scripts across various browsers..
It can be very useful even for load testing as it allows users to re-use existing functional tests and run them with virtual concurrent users. Selenium is a very powerful open-source testing tool mainly used for automated functional testing via interacting with browser level objects..
With a list of several programming languages, all main operating systems and browsers supported, Selenium is currently used in production in such companies as Netflix, Google, HubSpot, Fitbit, and more. The whole suite provides a range of solutions for different testing problems and needs.