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A __constructor__ is a member function with the same name as the class.

A constructor is responsible for initializing the object when it is created. It's a special member function that is executed whenever an object of its associated class is created, and it ensures that the object is set up correctly before it starts being used.

Consider a class called "Student" which includes member variables like name and age. The constructor function for this class would look like this: ```cpp class Student{ public: Student (string name, int age); // Constructor declaration // Other member functions... private: string name; int age; }; ``` And the implementation of the constructor would be: ```cpp Student::Student (string input_name, int input_age){ name = input_name; age = input_age; } ``` In this example, the constructor function "Student" has the same name as the class and initializes the member variables name and age with the given inputs. Once the constructor is called when creating the object, we can use the object knowing that its member variables are correctly initialized.