data

a collection of facts from which conclusions may be drawn

"statistical data"

otheruses Data is the plural of ''datum''. A datum is a ''statement accepted at face value'' (a "given").A large class of practically important statements are measurements or observations of a variable.Such statements may comprise numbers, words, or images.

Etymology - The word ''data'' is the plural of Latin ''datum'', neuter past participle of ''dare'', "to give",hence "something given".The past participle of "to give" has been used for millennia,in the sense of a statement accepted at face value;one of the works of Euclid, circa 300 BC,was the ''Dedomena'' (in Latin, ''Data'').In discussions of problems in geometry, mathematics, engineering, and so on,the terms ''givens'' and ''data'' are used interchangeably.Such usage is the origin of ''data'' as a concept in computer sciencedata'' are numbers, words, images, etc., accepted as they stand.

Usage in English - In English_language English,the word ''datum'' is still used in the general sense of "something given",and more specifically in cartography, geography, geology, and technical drawingdrafting to mean a reference point, reference line, or reference surface.The Latin plural ''data'' is also used as a plural in English,but it is also commonly treated as a mass noun and used in the singular.For example,"This is all the data from the experiment". This usage is inconsistent with the rules of Latin grammar,which would suggest "These are the data ...",each measurement or result being a single ''datum''.However,given the variety and irregularity of English plural constructions,there seem to be no grounds for arguing that ''data'' is incorrect as a singular mass noun in English.

Uses of ''data'' in computing - ''Raw data'' are numbers, character (computing)characters, s or other outputs from devices to convert physical quantities into symbols, in a very broad sense. Such data are typically further processprocessed by a human or input into a computer, Computer storagestored and processed there, or transmitted (output) to another human or computer. ''Raw data'' is a relative term; data processing commonly occurs by stages, and the "processed data" from one stage may be considered the "raw data" of the next.Mechanical computing devices are classified according to the means by which they represent data. An analog computer represents a datum as a voltage, distance, position, or other physical quantity. A digital computer represents a datum as a sequence of symbols drawn from a fixed alphabet. The most common digital computers use a binary alphabet, that is, an alphabet of two characters, typically denoted "0" and "1". More familiar representations, such as numbers and letters, are then constructed from the binary alphabet.Some special forms of data are distinguished. A computer program is a collection of data which can be interpreted as instructions. Most computer languages make a distinction between programs and the other data on which programs operate, but in some languages, notably Lisp programming languageLisp and similar languages, programs are essentially indistinguishable from other data. It is also useful to distinguish Metadata (computing)metadata, that is, a description of other data. The prototypical example of metadata is the library catalog, which is a description of the contents of books.

Meaning of data and information - Data on their own may have no meaning, and only when contextualized (perhaps through interpretation by some kind of data processing system) may it take on meaning and become information (see DIKW). For example, 5551973, a string of digits or a number, is data. When we think of this in the context of a phone number, we then have information: 555-1973 is a phone number. As it is, the phone number is not actionable - you know it is a phone number, but it is of no use. This information becomes knowledge when you can act on this information, either to solve a problem (for example, to call Helen, whose phone number it is), or to gain insight into an issue (e.g. by noting that 555 telephone number#Examplesother phone numbers have the same exchange).People or computers can find patternpatterns in and between data to perceive relationships between information, creating or enhancing knowledge. Since knowledge is prerequisite to wisdom, we always want more data and information. But, as modern societies verge on information overload, we especially need better ways to find patterns.

See also -

Data management

Data mining

Data modeling

Data processing

Data recovery

Data remanence and data destruction techniques

Data warehouse

Database

Datasheet

Data (Star Trek)

Statistics

Metadata

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