Fleming's Left-Hand Rule and Right-Hand Rule are essential principles for understanding the interaction between magnetic fields, electrical currents, and motion. The Left-Hand Rule, applicable to electric motors, uses the thumb, forefinger, and middle finger each pointing perpendicularly to indicate force direction, magnetic field direction, and current direction, respectively. Conversely, the Right-Hand Rule is used for electric generators, with finger assignments indicating the direction of motion, magnetic field, and induced current, respectively. These rules are pivotal in determining the directionality in electromagnetic applications, with the left-hand rule focusing on force in motors and the right-hand rule on motion in generators.