You need to download the selenium web driver for the specific browser on which you are going to perform your tasks through selenium .
the website would be SeleniumHQ Browser Automation
once the Webdriver is downloaded and extracted copy the path of the file .
in System. setPropety (Webdriver you would be using , path of the Webdriver ) mention the things within “” and perform a small task of opening the browser .
hope this helps
please make sure that web driver version supports the browser version