In many homes, the dishwasher is connected to the garbage disposal, but it is not a universal setup. Whether or not a dishwasher is connected to the garbage disposal depends on the plumbing configuration in the specific home.
The dishwasher is typically connected to the kitchen sink's drain system. The water from the dishwasher drains through a hose that is connected either directly to the garbage disposal or to a separate air gap device (if required by local plumbing codes). The air gap prevents any potential backflow from the garbage disposal into the dishwasher, ensuring that dirty water doesn't contaminate the dishes.
If the home does not have a garbage disposal, the dishwasher drain hose may be connected directly to the sink drain or a separate drainage line if one is available.
It's worth noting that the plumbing arrangements may differ based on local building codes and the specific setup of the kitchen. So, while it's common for dishwashers to be connected to garbage disposals, it's not always the case. If you're uncertain about your specific setup, it's a good idea to consult a plumber or a professional appliance installer for guidance.