A constructor is a special method that is automatically called when an object of a class is created. It is used to initialize the state of the object and perform any other setup that is required. The constructor has the same name as the class and does not have a return type.

A class can have multiple constructors with different parameters, this is called constructor overloading. The constructor with no parameter is called default constructor. If you don’t define any constructor in your class, the compiler will automatically provide a default constructor with no arguments and an empty body.

The main purpose of constructors is to initialize the state of an object when it is created and perform any other setup that is required. They are also used to ensure that objects are created in a consistent state and to make it easy to create new objects with specific properties.