The description of a programming language is usually split into the two components of syntax (form) and semantics (meaning). the desired result is specified, not how to achieve it). Many programming languages are written in an imperative form (i.e., as a sequence of operations to perform) while other languages use the declarative form (i.e. Thousands of different programming languages have been created, and more are being created every year. The programs for these machines (such as a player piano's scrolls) did not produce different behavior in response to different inputs or conditions. Since the early 1800s, programs have been used to direct the behavior of machines such as Jacquard looms, music boxes and player pianos. There are programmable machines that use a set of specific instructions, rather than general programming languages. Most programming languages consist of instructions for computers. Programming languages are used in computer programming to implement algorithms. A programming language is a formal language comprising a set of instructions that produce various kinds of output.
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