1. Open source software to automate the web applications 2. Only Core java basic knowledge is required to easily use selenium web driver 3. It is widely accepted as enterprise choice to go for as a test automation tool 4.Works Across Multiple OS 5. Cross Browser Compatibility Testing 6. Supports Multiple Frameworks and Languages 7. Cross-Device Testing 8. Community Support 9. Easy to Implement.

Selenium IDE is very simple tool to start with test automation, it has record and playback functionality which are easy to implement without having much programming knowledge, automaton test can be created and executed quickly with this.

Selenium WebDriver is free, open source and probably the best automation tool in the market. It can be written in different languages like java, dot net, ruby, python etc. It can be executed on any Operating system and supports almost all major browsers. Its community forums and user base is huge. We can create our own frameworks based on our needs. It can be easily integrated with custom automation frameworks like TestNG to generate test reports quickly and easily. Scripts are reusable and hence it is best used for functional testing or regression testing.