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Selenium IDE (Integrated Development Environment) is the simplest tool in the Selenium Suite. It is a Firefox add-on that creates tests very quickly through its record-and-playback functionality.
WebDriver is a web automation framework that allows you to execute your tests against different browsers, not just Firefox (unlike Selenium IDE).
Selenium Grid is a part of the Selenium Suite that specializes on running multiple tests across different browsers, operating systems, and machines in parallel.
Selenium IDE is a component of selenium which Firefox plug in only. It is not object oriented tool.It is record and playback tool.
Selenium web driver is object oriented tool which directly communicate with different browsers.
Selenium grid is specializes on running multiple tests across different browsers,operating systems, and machine parallel.
