A power tool is an instrument that’s actuated by yet another power source and mechanism other than the solely manual labor used in combination with hand tools. The most common types of power equipment use electric motors. Internal combustion engines and compressed air are also generally used. Other power resources include steam engines, immediate burning of fuels and propellants, such as for example in powder-actuated equipment, or even natural power resources such as wind or moving drinking water. Tools directly driven by pet power are not generally considered power tools.
Power tools are used in industry, in building, in the garden, for housework duties such as cooking, cleaning, and throughout the house for purposes of generating (fasteners), drilling, slicing, 
shaping, sanding, grinding, routing, polishing, painting, heating system and more.
Power tools are classified because either stationary or portable, where portable means hand-held. Portable power equipment have apparent advantages in mobility. Stationary power equipment, however, often have advantages in velocity and accuracy. An average table saw, for example, not only cuts faster when compared to a regular hands saw, but the cuts are smoother, straighter, and more sq . than what is normally achievable with a hand-held power saw. Some stationary power tools can produce objects that cannot be made in any other way. Lathes, for example, produce truly round objects.
Stationary power tools for metalworking are often called machine tools. The term machine tool is not usually put on stationary power tools for woodworking, although such electric power tools utilization is occasionally heard, and perhaps, such as drill presses and bench grinders, specifically the same device is utilized for both woodworking and metalworking.
