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As described in the Automation Pipeline document, a driver must be present on the same machine as the browser you are automating.

If you are running locally, you can use the webdrivers gem to automatically ensure that the latest driver is downloaded, and placed in a location where Selenium can access it.

Otherwise, you can download the drivers for the browser of your choice:

For all browsers except for Safari, you then need to move the driver onto your PATH. This can be especially tricky in Windows.

Alternately, you can avoid dealing with drivers entirely and use an online service provider to manage everything for you.