There are two monorail routes serving the Magic Kingdom. One route goes from the TTC (Transportation and Ticket Center) to the Polynesian to the Grand Floridian to the Magic Kingdom to the Contemporary and back to the TTC--this is known as the Resort Monorail. The other route makes the same loop but with no stops, (and in reverse to boot, this one goes counterclockwise while the Resort monorail goes clockwise) it goes from the MK to the TTC and back again.
The third monorail route goes directly to Epcot from the TTC. If you are going from the MK to Epcot, you would take one monorail to the TTC and change to the Epcot monorail for the rest of the trip. This route has no stops except for the TTC and Epcot.