Thousands of different programming languages have been created, mainly in the computing field. Programming languages differ from most other forms of human expression in that they require a greater degree of precision and completeness.
When using a natural language to communicate with other people, human authors and speakers can be ambiguous and make small errors, and still expect their intent to be understood. However, figuratively speaking, computers "do exactly what they are told to do", and cannot "understand" what code the programmer intended to write. The combination of the language definition, a program, and the program's inputs must fully specify the external behavior that occurs when the program is executed, within the domain of control of that program. On the other hand, ideas about an algorithm can be communicated to humans without the precision required for execution by using pseudocode, which interleaves natural language with code written in a programming language.
A programming language provides a structured mechanism for defining pieces of data, and the operations or transformations that may be carried out automatically on that data. A programmer uses the abstractions present in the language to represent the concepts involved in a computation. These concepts are represented as a collection of the simplest elements available (called primitives). Programming is the process by which programmers combine these primitives to compose new programs, or adapt existing ones to new uses or a changing environment.
Programs for a computer might be executed in a batch process without human interaction, or a user might type commands in an interactive session of an interpreter. In this case the "commands" are simply programs, whose execution is chained together. When a language is used to give commands to a software application (such as a shell) it is called a scripting language.
Read more about this topic: Programming Language
Other articles related to "usage":
... its other meanings, it has also acquired "a widespread current usage" amongst young people, as a general term of disparagement ... This pejorative usage has its origins in the late 1970s ... Beginning in the 1980s and especially in the late 1990s, the usage as a generic insult became common among young people ...
... to Jeremy Butterfield, "The first person we know of who made usage refer to language was Daniel Defoe, at the end of the seventeenth century" ...
... For Wikipedia's own standards for hyphen usage, see WikipediaManual of Style#Hyphens Hyphens are mostly used to break single words into parts, or to join ordinarily separate words ... rules does not exist rather, different manuals of style prescribe different usage guidelines ...
... to popularise the "U", or upper-class, and "non-U" classification of linguistic usage and behaviour (see U and non-U English) — although this is something ... inventor and main preserver of this usage ... as an example of upper-class linguistic usage ...
... In older Javanese usage and in modern Balinese usage, gong is used to identify an ensemble of instruments ... In contemporary central Javanese usage, the term gamelan is preferred and the term gong is reserved for the gong ageng, the largest instrument of ... In Balinese usage, gong refers to Gamelan Gong Kebyar ...
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