why are computers important in the world of IT?

 The earliest mechanical computer was invented thousands of years ago.It was a mechanism that was used  to calculate the movements of stars and plants in astronomy.

               However, the first mechanical calculator capable of performing the four basic arithmetical operation was developed only in 1645.The colossus, developed during world war II, was the world’s first electronic digital programmable computer. It was used to decrypt German messages. Colossus was designed by engineer Tommy Flowers with inputs from Sidney Broad Hurst, William Chandler, Allen Coombs and Harry Fenson.

                      The first electronic digital stored-program computer was the Manchester Small-scale Experimental Machine or SSEM that was developed in 1948.