Data (can be singular or plural in common usage)
The quantities, characters, or symbols on which operations are performed by a computer, which may be stored and transmitted in the form of electrical signals and recorded on magnetic, optical, or mechanical recording media. (The terms data, information and knowledge are frequently used for overlapping concepts. The main difference is in the level of abstraction being considered. Data is a broad term, embracing others, but is often the lowest level of abstraction, information is the next level and, finally, knowledge is the highest level.) See Raw data, Derived data, Metadata.