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Computer are machine that perform tasks or calculations according to a set of instructoin or program. The first fully electronic computer ,instruction i the 1940s,were huge machines that required teams teams of people operate.Compared to those early machines ,today 's computer are amazing .

Computer work through an interaction of hardware and software .The most important piece of hardware is a tiny rectangular chip inside your computer called the Central Processing Unit (CPU)or microprocessor.Hardware item such as monitor , keyboard , mouse , printer , and other items are often called hardware device.

The operating system (OS) is a software that manages your computer and the device connected to it .Your computer uses the Window operating system.