Okay, so first of all you might be wondering what the difference is between a layover and a stopover. The distinction between the two lies in the length of time between connecting flights.
A layover is a connection between flights that is less than 4 hours on a domestic flight or less than 24 hours on an international flight. Layovers typically involve changing gates and planes, but some journeys do include layovers with no plane change at all.
A stopover is a connection between international flights that is at least 24 hours in length and sometimes longer.