What is Rembrandt lighting and how is it used in photography?

Rembrandt lighting is a technique in Photography where the subject is illuminated from one side, creating a triangle of light on the opposite cheek. This technique is named after the Dutch painter Rembrandt, who often used this type of lighting in his portraits. It is commonly used in portrait photography to create a dramatic and moody effect by emphasizing the contours and features of the subject's face.