The difference between a standard and extended length tennis racket lies in the length of the racket and the impact it has on the player's game.
A standard length tennis racket typically measures around 27 inches in length. This is the most common size of tennis racket and is used by the majority of players. Standard length rackets offer good control and maneuverability, and they are a good choice for players who prefer to play close to the net and use a lot of volleys and touch shots.
An extended length tennis racket is usually between 27.5 and 29 inches in length. The longer length of the racket provides a larger reach, allowing players to hit shots with greater power and spin. Extended length rackets are ideal for players who like to play from the baseline and hit groundstrokes with a lot of topspin. They are also a good choice for taller players, as the extra length can help to compensate for their height.
It's important to note that extended length rackets can be heavier and more difficult to maneuver than standard length rackets, which may not be suitable for all players. Players should try out both standard and extended length rackets to determine which size feels most comfortable and allows them to play their best tennis.