What are the main differences in sound and construction between a xylophone, a marimba, and a vibraphone?

The main differences between a xylophone, a marimba, and a vibraphone lie in their sound and construction. The xylophone has wooden bars that produce a bright and sharp sound, while the marimba has larger wooden bars that create a warmer and richer tone. The vibraphone has metal bars and uses motor-driven fans to create a vibrato effect, giving it a more ethereal sound compared to the other two instruments.