This slide is based on Object Oriented Programming Language. Here is some details about object and class. You can easily understand about object and class.
4. In object-oriented programming , a class is a template definition of the
methods and variables in a particular kind of object . Thus, an object is
a specific instance of a class; it contains real values instead of variables.
The class is one of the defining ideas of object-oriented programming.
What is CLASS?
10. What is OBJECT?
An object is a member or an "instance" of a class. An object has a
state in which all of its properties have values that you either
explicitly define or that are defined by default settings. This subtle
conceptual difference between classes and objects shows why there
is a tendency to want to use them interchangeably.