The aim of this article is to explain an overview of Automation. Automation is using various control methods for operating equipment for instance machinery, processes within factories, boilers and heat treating stoves, switching in telephone networks, steering and stabilization of lines, aircraft and different applications with nominal or reduced people intervention. Some processes have been completely automated. The biggest good thing about automation is that it saves labor, however, it is also used to save energy and materials in order to improve quality, accuracy and precision. The many various functions automation can be used for can always be classified into a pair of main types, responses control and sequential handle.