Where could the water leaking from in my Dishwasher?
This could be a number of things (any part that carries water could leak...) and is therefore unanswerable as asked.
However, prior to voting to close this question I will say that the main unit that is located centrally in the bottom of the tub and contains the motor, pump(s), and main spray arm usually has a large diameter ring gasket that is the primary seal between the water in the tub and the floor beneath the unit.