Sister Act is a hilarious comedy movie starring Whoopi Goldberg as Deloris Van Cartier, a lounge singer who witnesses a murder and is placed in a convent for her own safety. Disguised as a nun, Deloris brings her unique style and personality to the convent's choir, transforming them into a sensational singing group. With its catchy music, witty dialogue, and memorable performances, Sister Act is a feel-good comedy that celebrates the power of music, friendship, and self-discovery.