How does the type of tennis racquet string affect ball movement?

Although the vast majority of ball movement (i.e., direction, trajectory, speed, and spin) is under the control of the person wielding the tennis racquet, the string can have a slightaffect on the ball, depending on its thickness (gauge) and how tightly it is strung onto the racquet, even though the ball is on the strings only 1/100th of a second. For more information, refer to the "Introduction to Racquet Science" link, below.