noun-plural. See datum.noun-plural. a collection of facts, observations, or other information related to a particular question or problem.noun-plural. information, most commonly in the form of a series of binary digits, stored on a physical storage medium for manipulation by a computer program. It is contrasted with the program which is a series of instructions used by the central processing unit of a computer to manipulate the data. In some conputers data and execuatble programs are stored in separate locations.