A power tools is any tool that has an outside source of power in addition to manual power to run. Most of the common power tools that you will find today are going to run on electric motors. In some cases, compressed air is the source of power, and other tools may use internal combustion. Power tools are common everywhere today, from workshops in the garage or cellar to construction sites and well beyond. The two basic types of power tools are stationary and portable. The stationary tools are going to be the larger tools, while the smaller devices are portable, naturally.