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In modern programming languages, source code can appear in the form of books or tapes, but the most commonly used format is a text file. The purpose of this typical format is to compile a computer program. The ultimate goal of computer source code is to translate human-readable text into binary instructions that the computer can execute. This process is called compilation and is completed by a compiler.
Source code, as a special part of the software, may be contained in one or more files. A program does not have to be written in the same format as source code. For example, if a program is supported by a C language library, it can be written in C language; while another part can be written in assembly language in order to achieve higher operating efficiency.