What is the difference between walkers and rollators?

A walker either has no wheels, or it has a pair of wheels on the front of the frame. It is intended for a person with a slow gait and balance issues and is designed to bear the weight of the person as they step. A rollator, on the other hand, has three or four wheels, and is intended for use by a person who can still walk at a normal pace but needs some help with balance and posture. A rollator also has handbrakes and a seat for resting, and is designed for outdoor use, while a walker is generally used indoors.