In 1672, Blaise Pascal invented the first mechanical computer. Charles Babbage designed the first completely programmable mechanical computer known as “Analytical Engine” in the year 1837. Alan Turing is regarded as the father of modern computer science and in 1936 officially provided the concept of computation and algorithm with the machine of turing. He presented the blueprint of electronic digital computer. In 1941, a German engineer Konrad Zuse invented the first working computer. On November 1937, George Stikitz built a relay based calculator and is regarded as the father of modern digital computer.