How is a motel different from a hotel?

The word "motel" is derived from the two words "motor" and "hotel". A motel is a hotel catering mainly to motorists, so has those characteristics. Generally along a highway and meeting the needs of travelers.

The doors to motels go directly outside. Hotel rooms lead into the building.

Hotels have hallways. Motels don't. You just open the door and you're inside your room.

First difference is the spelling :-)

A motel is usually for customers with cars and has less facilities than a hotel.

Motels usually have all their rooms with direct access to a car-park; hotels usually don't.

In addition to the answer above most motels don't exceed 2 floors in height whereas hotels can be extremely tall. Hotels usually have valets, bellboys, restaurants, gift shops, sometimes a beauty salon & a bar plus hotels cost more.