Selenium is a web automation system. This allows you to write code that "controls" the browser, so you can automate clicks on the site, filling out forms, etc.
FitNesse is an acceptance testing platform - it is a tool for documenting acceptance tests as verifiable code. You can run your tests and see if they pass or not.
The two are complementary - you donβt need to use Selenium with FitNesse or vice versa, but for testing websites itβs good to have your acceptance tests written in FitNesse (or similar frameworks) and have them use Selenium to control the browser.
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