| No | Word | Definition |
| 1 | Object Orientation | View real world as objects with some things in common. They all have attributes and behaviors. |
| 2 | Class | A template that is used to define attributes and functions shared by all objects belonging to this class. |
| 3 | Object | An instance of a class which contains data (values of attributes defined in the class) and behavior (represented by functions defined in the class). |