The most widely used freeware and open source automation tool is Selenium. Selenium has a lot of advantages when it comes to test automation. It also allows for recording and playback for testing web applications, as well as the execution of numerous scripts across multiple browsers.
A test script is a set of instructions for autonomously testing an application. In a manual testing environment, Test Cases are employed. In the automation testing environment, Test Script is employed. It's done by hand. It is carried out in accordance with the scripting format.