What are the top 5 hotels chains?

Can you provide me with a brief overview of the top 5 hotel chains in the industry? I'm particularly interested in knowing what sets them apart from their competitors, their global reach, and any notable awards or accolades they may have received. Additionally, I'd like to understand if they offer any unique services or amenities that make them stand out to travelers. Ultimately, I'm looking to gain a deeper understanding of the top players in the hotel industry and how they continue to innovate and thrive in today's competitive market.