The head is the part of the tennis racket surrounding the strings. The head comes in different sizes: oversized between 100 and 140 sq. in., mid-size from 85 to 100 sq. in. and standard size from 80 to 85 sq. in.
The strings can be strung with different tensions. Those with high tension give the player more control over the ball, but less power. Lower tension gives more power but less control.
The beam is on both sides of the head, making the head thicker. The wider the beam, the more powerful the shot will be.
The throat is the part of the tennis racket right below the head. An open throat makes the head of the racket more stable.
The shaft begins where the two sides of the throat come together and continue down to become the grip.
The grip is the end of the tennis racket. It can range in diameter from 4 to 4 5/8 inches around.