It is about the movement when pressing the arrow key inkeyboard. Can someone explain to me this code?

Thanks for your kindness and help. Much appreciate! Can someone explain to me this part of the coding:

      {
        if (GetAsyncKeyState(VK_UP)) {
            if (map[y - 1][x] == '.') { y--; pts++; }
            else if (map[y - 1][x] == ' ') y--;
        }
        if (GetAsyncKeyState(VK_DOWN)) {
            if (map[y + 1][x] == '.') { y++; pts++; }
            else if (map[y + 1][x] == ' ') y++;
        }
        if (GetAsyncKeyState(VK_LEFT)) {
            if (map[y][x - 1] == '.') { x--; pts++; }
            else if (map[y][x - 1] == ' ') x--;
        }
        if (GetAsyncKeyState(VK_RIGHT)) {
            if (map[y][x + 1] == '.') { x++; pts++; }
            else if (map[y][x + 1] == ' ') x++;
        }
      }