Selenium is a powerful automation tool primarily used for testing web applications across different browsers and platforms. It supports the automation of various types of web-based software applications, including e-commerce websites, content management systems, online portals, banking applications, and enterprise web solutions. However, Selenium cannot be used to test desktop or mobile native applications directly. For those aiming to master automation testing for diverse web applications, enrolling in a Selenium certification program is highly recommended. These courses cover real-time projects and multiple application testing scenarios, helping students and professionals build practical skills and advance their careers in automation testing.