When the first computer appeared , no one can say for sure. Man has always sought to simplify and speed up the process of counting, not knowing what a modern calculator will turn into. The wealth of the tribes grew, and fingers on their hands were no longer enough to count. Pebbles and sticks were used, with the help of which primary mathematics, the decimal system of calculus, could be born. Some time passed, and wearing so many pebbles and sticks just became uncomfortable. A question arose in improving computations, and perhaps the “thought” arose about creating a machine for counting. Ancient men puzzled over the method of calculating profits and accounting for goods, livestock, and utensils.
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So the answer to the question "What is a computer?" raises a huge layer of historical events and technological innovations that have evolved from pebbles to superconductors.