what is the swap keyword in c++ code example

Example 1: swap in cpp

int a{}, b{}, temp{};
cin >> a >> b;

  //===================== METHOD-1
   temp = a;
   a = b;
   b = temp;

  //===================== METHOD-2 ( XOR ^ )
  // example: a^b =  5^7
   a = a ^ b;   // 5^7
   b = a ^ b;   // 5 ^ 7 ^ 7  //5 ( 7 & 7 dismissed)
   a = a ^ b;   // 5 ^ 7 ^ 5  //7 ( 5 & 5 dismissed)

  //===================== METHOD-3  ( swap() )
  swap(a, b);

  cout << "a " << a << endl;
  cout << "b " << b << endl;

Example 2: c++ swap function

int main()
{
	int a = 5;
	int b = 10;
  
	swap(a, b);
  
	cout << "a = " << a << endl;
	cout << "b = " << b << endl;
}