The first computer of the world was the ENIAC (Electronic Numerical Integrator and Computer), a conception of the Professor John Mauchly, jointly with professor J. Presper Eckert. Mauchly and the Eckert had considered in 1943 the North American army, in full World War II, the construction of this first computer, having as objectivo I assist it in the necessary calculations of precision for the ballistics. The ENIAC weighed 30 tons and delayed 12 hours until if getting the same resulted. In 1955, a computer already only weighed 3 tons