what does a class do in C++ code example

Example 1: c++ class method example

class Object {
public:
	int var;
	void setVar(int n) {
		var = n;
	}
	int getNum() {
		return var;
	}
};

int main() {
	Object obj;
	obj.setVar(13);
	std::cout << obj.getNum() << std::endl;
	return 0;
}

Example 2: c++ public class declaration

class class_name {
  access_specifier_1:
    member1;
  access_specifier_2:
    member2;
  ...
} object_names;