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Abstract In this essay we are going to have a brief look in what is an operational amplifier, how does it work and which are its main applications. Introduction Amplifiers are a big part of the subject of electronics. The amplifiers have a huge variety of applications in scientific projects and everyday life. A specific of amplifier type used widely is the operational amplifier. Operational amplifiers are used in so many different ways that it is not possible to describe all of the applications. Entire books are devoted entirely to the applications of operational amplifiers and are not concerned in theory of operation or other circuits at all. This project will provide all the introductory theory about the operation of the operational amplifiers and will analyze a few basic and well-known applications. A few words about Operational amplifiers The name operational amplifier was originally adopted for a series of high performance DC (Direct Current) amplifiers used in analog computers. These amplifiers were used to perform mathematical operations applicable to analog computation such as summation, scaling, subtraction, integrating and essentially any feedback operation. The applications of operational amplif