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A roll program or tilt maneuver is an aerodynamic maneuver that alters the attitude of a vertically launched space launch vehicle. The maneuver is used to place the spacecraft on a proper heading toward its intended orbit.
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A roll program is completed shortly after the vehicle clears the tower. In the case of a crewed mission, a crew member (usually the commander) reports the roll to mission control which is then acknowledged by the capsule communicator.
Space Shuttle launch
During the launch of a space shuttle, the roll program was simultaneously accompanied by a pitch maneuver and yaw maneuver.
The roll program occurred during a shuttle launch for the following reasons:
Titan II and Saturn V launch
Titan II and Saturn V launches also required roll programs.
References
Roll program Wikipedia(Text) CC BY-SA