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The firmware cordinate the teamwork of the hardware (like keyboard, memory, disk drive, hard disk drive, etc.) and the software (like operating system, applications, games, tools, etc.) is needed for simply work with a computer system.
Also is a computer a system, that contains a central processing unit (short: CPU, or also processor), which processed the infos or datas. The datas are binary digits, which combined by addition, subtraction or by operators like AND, OR, NOT.