At the time of Roman and Greeks the first computing machine was invented named as Abacus.It was based on rods and beads and these rods and beads show the storage.Basically this machine was used as a calculating machine.From that time computer reveloution begans and proceeded to success day by day.
In 1981 IBM introduces the first desktop computer which is known as personal computer or PC.And the operating system of this pc was installed by the young software company at that time known as "MICROSOFT".And then day by day technology improves and now you can see the level of computer science.And now desktop PC's are replacing by laptops as well.
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