Introduction to OOP | Chapter 10: Subclasses and Subtypes: | next | previous | audio | real | text |

- A set of values. (The type int, for example, describes -2147483648 to 2147483647)
- A set of operations. (We can do arithmetic on ints, not on booleans).
- A set of properties. (If we divide 8 by 5 we are not surprized when the result is 1, and not 1.6).