Drivers are required for different types of browsers. The biggest change in Selenium recently has been the inclusion of the WebDriver API. Driving a browser natively as a user would either locally or on a remote machine using the Selenium Server it marks a leap forward in terms of browser automation.
Exploratory testing is about exploring, finding out about the software, what it does, what it doesn't do, what works and what doesn't work. Testers have to understand the application first by exploring the application and based on this understand they should come up with the test scenarios. After that start actual testing of application.
Selenium uses locators to find and match the elements on website page. Selenium WebDriver uses different locators to find the elements on web page. Locator is a command that tells Selenium IDE which GUI elements ( say Text Box, Buttons, Check Boxes etc) its needs to operate on.
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