Information Technology
Devices have been used to aid computation for thousands of years, probably initially in the form of a tally stick.The Antikythera mechanism, dating from about the beginning of the first century BC, is generally considered to be the earliest known mechanical analog computers, and the earliest known geared mechanism. Comparable geared devices did not emerge in Europe until the 16th century, and it was not until 1645 that the first mechanical computers capable of performing the four basic arithmetical operations was developed. Electronic computers, using either relays or valves, began to appear in the early 1940s. The electromechanical Zuse Z3, completed in 1941, was the world’s first programmable computer, and by modern standards one of the first machines that could be considered a complete computing machine.
Commercial and employment perspective
Companies in the information technology field are often discussed as a group as the “tech sector” or the “tech industry”.
Many companies now have IT departments for managing the computers, networks, and other technical areas of their businesses.
The future of computers 