which design pattern to use to get the wanted functionality

I want to make a pure virtual class that other classes inherit from it and each class implements the same function but with different implementation: let say I implement class Server

class Server
{
   Server();
   ~Server()=0;
   virtual void send(const std::string& string);
   virtual std::string resive();
};

class TcpServer:public Server
{
   TcpServer();
   ~TcpServer();
   void send(const std::string& string)
   {...}
   std::string resive(){...}
};

class UdpServer : public Server
{
    UdpServer ();
    ~UdpServer ();
    void send(const std::string& string)
    {...}
    std::string resive(){...}
};



main()
{
    Server* server = new TcpServer()/UdpServer;
}

How does this Design Pattern call? because I don't understand if it Adapter or Composite or Facade and if you have a different idea of how to implement this behavior.