The dishwasher has a small cup in the corner

What is this Feature?

Soap Dispenser Restore Port:

In many modern kitchens, this small cup is actually the refresh port for a built-in soap dispenser. It permitted users to easily refill dish soap or hand soap without unscrewing the dispenser bottle underneath the sink.

Air Gap (For Dishwashers):

It is an air gap for the dishwasher, a detail required in some regions to prevent contaminated water from backing up into clean water lines. It is arranged to improve water drainage and maintain hygiene.