It is very common at the majority of hotels (in the US at least), that there is a daily free breakfast available to all guests in or near the lobby. It is buffet style and available within a time window that's often on the earlier side. The quality varies some, but it's normally on the cheap side. But for something that is included in the price of the room and gives you something warm and filling in the morning, it's often good enough in my experience. Some that I've had were even notably good. Though there has been a couple hotels where the food was so limited in selection or poor enough in quality that I chose to go out for a hot breakfast instead.