Define the Fundamentals of computer system

A computer processes digital information. In order to do that it runs (executes) a machine language program. As an illustration, when we buy software, like the Microsoft Word, we buy machine language program of the Word software. A machine language program manipulates data. A machine language program comprises machine language instructions. A machine language instruction is a simple command which can be immediately understood by the hardware. It commands the computer to perform a simple operation like add, subtract and shift left, etc. Hence, it can be directly run by the computer (hardware).