- object: thing we can imagine
  - data
  - ops that manipulate data
- programs: interacting objects
- notation: UML = Unified Modeling Language
- mulitple objs of same type in program
- program has instr to create objs
- class: obj definition
  - what objs can and cannot do
- obj: instance of exactly one class
  - obj "belongs to" class
- no lim on # instances of a class

Quick Check:
1. 
     ________
    |        |
    | Person |
    |        |
    |________|

    ____________________
   |                    |
   | Ms. Latte : Person |
   | ------------------ |
   |____________________|

    _______________________
   |                       |
   | Mr. Espresso : Person |
   | --------------------- |
   |_______________________|

2. The class.