A class is a template in object-oriented programming that specifies how to construct objects, what their initial values should be for state (in the form of member variables or attributes), and how behaviors should be implemented.

The class keyword is used to generate the custom objects. Class acts as a template, outlining the characteristics of an eventual object. Definition: An instance is a single instance of a class. Classes are an essential part of object-oriented programming and a way to recycle existing code by making it easy to create and manage new objects and facilitate inheritance.