A computer program is a structuredcollection of instructionsequences that perform a specific task when executed by a computer. A computer requires programs to function. A computer program is usually written by a computer programmer in a programming language. From the program in its human-readable form of source code, a compiler can derive machine code - a form consisting of instructions that the computer can directly execute. Alternatively, a computer program may be executed with the aid of an interpreter.The evolution of a process is directed by a pattern of rules called a program. People create programs to direct processes.
