Refer to figure.
An Attitude Director Indicator (ADI) is an essential instrument in an aircraft's cockpit that combines the functionalities of the attitude indicator and the flight director.

The attitude indicator provides crucial information about the aircraft's orientation relative to the horizon, indicating pitch and roll angles.

On the other hand, the flight director offers guidance for achieving the desired flight path, typically displaying command bars or cues that pilots can follow to maintain the correct trajectory.

Integrating these two instruments helps the ADI maintain situational awareness and follow navigational commands more effectively, enhancing flight safety and operational efficiency.