how does getline work in c++ code example

Example 1: getline cpp

//getline allows for multi word input including spaces ex. "Jim Barens"
#include <iostream>
#include <string>

int main() 
{
  string namePerson{};     // creating string
  getline(cin, namePerson);// using getline for user input
  std::cout << namePerson; // output string namePerson
}

Example 2: get line C++

// extract to string
#include <iostream>
#include <string>

int main ()
{
  std::string name;

  std::cout << "Please, enter your full name: ";
  std::getline (std::cin,name);
  std::cout << "Hello, " << name << "!\n";

  return 0;
}