Is-a abstraction takes a complex system, and views it as an instance of
a more general abstraction.
Characterized by sentences that have the words ``is=a''
Allows us to categorize artifacts and information and make it applicable to many
- A car is a wheeled vehicle, which is-a means of transportation
- A bicycle is-a wheeled vehicle
- A pack horse is-a means of transportation
Intro OOP, Chapter 2, Slide 16