system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How Do Hotel Star Ratings Work?

Who decides what star rating is awarded to a hotel? What are the most important sources for these ratings? Who decides which hotels get reviewed by "professionals" and which ones get rated on websites like yelp?
gpt
Most hotel star rating systems indicate the amenities/luxuries  available at a hotel, rather than their quality.  A one star hotel offers basic services (room and bath, table and chair, reception staff, etc).  A two star hotel adds things like a reading light, breakfast buffet, offer of toothpaste and other toiletries.  And on up to valet parking, concierge, 24 hour room service, one hour ironing, turndown service and other luxurious features.