Data refers to a collection of measurements. For example: Data can be collected for the volume of a gas or the type of rubber. e.g. Bob, Becky and Bill's data was a collection of measurements to do with the internal shape of a box. Datum is just the singular of data. e.g. Bob's measurement of the height (9 cm) is a datum. This term is not really very widely used, so don't worry too much about it!
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