Robots are simply computers that can interact with their environment. Some are fixed in place in industrial assembly plants for cars, appliances, micro electronic circuitry, and pharmaceuticals. Another important category of robots is the mobiles, machines that can be driven to the workplace, often designed for hazardous duty operation or broad-area inspections and surveillance. This article gives a background on mobile robot technology, along with ideas for helping students explore the robotics field. (Contains 6 photos.)