This book helps children to understand the working principle of computers which is essential for scientific enlightenment education. Who invented the computer? How does a computer work? In the 17th century, Leibniz invented the binary system, on which modern computing is based. The real computer was actually not invented until the Second World War. Because decoding enemy intelligence requires a lot of complex calculations and to build missiles and atomic bombs requires even greater computation. In this way, the invention of the computer was promoted.