no you might just want to drop it so you can hit it up and it is called an underhand serve
this depends on how skilled you are.
The underarm serve in tennis is sometimes seen as disrespectful because it is perceived as a sneaky or unconventional way to serve the ball, catching the opponent off guard. Traditional tennis etiquette values fair play and sportsmanship, so using an underarm serve can be seen as trying to gain an unfair advantage.
Forehand, Backhand, Smash, Volley and Serve(which i dont think is counted as a shot)
Forehand Backhand serve volley smash
Rotation - when the player rotate to serve.
When you serve, you start the volley back and forth until somebody wins the point.
Serve is done when a new game, a new match has to start. A coin toss is decidedt who will serve first for the match. Each players serves until a particular game is finished that is 15-30-40 and game. Serve is not changed on every point but it is broken after every game. A volley is form of a shot played in the game of tennis. A volley is hit without letting the ball bounce. This shot is mostly hit when the player is near to the net. There are forehand volleys and backhand volleys. I hope i have explained enough
You can hit an underhand serve in tennis; however, the overhand serve is more effective because it is more powerful. That is why you don't see the underhand serve used much.
The serve initiates play and any points earned.
Your muscles help perform a volley ball serve or skill by transferring your muscles' energies from your body into the ball, causing it to fly to the other side. It involves mostly hand, arm, and back muscles.
If by what you mean is are you allowed to hit the return before it bounces - NO.
A team will rotate whenever they get the serve back. And you rotate clockwise..