A value used to describe a particular characteristic of a data element. There are four different instances available for each data element, namely: average, maximum, minimum, and delta.

a particular variable of that datatype

a particular variable of this datatype

A particular example or entry of an entity; Welwyn Garden City is an instance of the entity `towns'.

A particular case of a problem.

a set of values representing a specific entity belonging to a particular entity type.