Why are flexible couplings used and what are the common types?

Flexible couplings accommodate shaft misalignment (angular, parallel, and axial), absorb shock and vibration, and protect connected equipment from overloads. Common types include jaw/spider couplings (elastomer insert, general purpose), disc couplings (high precision), gear couplings (high torque), oldham couplings (parallel misalignment), and bellows couplings (zero backlash). Selection depends on misalignment type, torque, speed, and environment.