Programming:Program execution

A modern day computer program is loaded into memory (usually by the operating system), interpreted and then executed ("run") instruction by instruction until "program termination", either with success or through computer error. Some primitive types of computers ran instructions encoded in various ways, an example would be punch cards.

Before a computer can execute any sort of program (including the operating system which is also a program) the computer hardware must be initialized. This is done by a piece of software stored on programmable memory chips installed by the manufacturer called the BIOS. The BIOS will attempt to initialize the boot sequence making the computer ready for miscellaneous program execution.

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