class meaning in c++ code example

Example 1: classes c++

class Rectangle {
    int width, height;
  public:
    void set_values (int,int);
    int area (void);
} rect;

Example 2: class in c++

class Name {
  private:
  	int data;
  
  public:
  
    // Constructor
  	Name() {
		// Code      
    }
  	int id;
  	void fun1(int a) {
        // Some instructions here 
    }
 	 
}