What are the advantages of a shaft-driven bicycle compared to a chain-driven bicycle?

A shaft-driven bicycle has advantages over a chain-driven bicycle in terms of lower maintenance, cleaner operation, and smoother ride. The shaft drive system requires less maintenance as it does not need regular lubrication or cleaning like a chain does. Additionally, it keeps the bike cleaner as there is no exposed chain to collect dirt and grime. The shaft drive also provides a smoother and quieter ride compared to a chain, making it a more comfortable option for cyclists.