OO Principles

1. Accessor: is a method that is used to ask an object about itself. ( propery get)
2. Mutator: public method used to modify the state of an object.(property set)
3. Encapsulation: hiding data implementation by restricting access to accessors and mutators
4. Abstraction: 
5. inheritance: is a relationship
6. polymorphism:  one name many forms.