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Declarative programming
Declarative programming is a term with two distinct meanings, both of which are in current use.According to one definition, a program is "declarative" if it describes what something is like, rather than how to create it. For example, HTML web pages are declarative because they describe what the page should contain — title, text, images — but not how to actually display the page on a computer screen. This is a different approach from imperative programming languages such as Fortran, C, and Java, which require the programmer to specify an algorithm to be run. In short, imperative programs explicitly specify an algorithm to achieve a goal, while declarative programs explicitly specify the goal and leave the implementation of the algorithm to the support software (for example, a SQL select statement specifies the properties of the data to be extracted from a database, not the process of extracting the data).
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