Q1: Why do we use Shared_ptr in the following Code?What does make shared do?

typedef std::shared_ptr<GameData> GameDataRef;
 class Game {
 public :
  Game(int width, int height, std::string title);
 private:
  const float dt = 1.0f / 60.0f;
  sf::Clock clock;
  GameDataRef _data = std::make_shared < GameData>();
  void Run();

Q2:  I have never used std::move ? can you explain why we use move in the follwing code?

this->_newState =std ::move(newState);//newstate is a pointer .