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The primary use of the passes tab is to create additional outputs for your render. These are also known as Arbitrary Output Variables (AOVs).
It is also possible to create additional "passes", which are more akin to Maya's render layers (which are also supported). Passes can each have their own camera and render settings, which act as overrides of global render settings.
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Choose the output file format of the Display Driver, including Deep Data (DeepEXR)
OpenEXR
OpenEXR is the most common, versatile, and capable file format for renders. It is the default and recommended file type. Denoise functionality requires OpenEXR or TIFF types.
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