Demand refers to requests for a hotel's inventory and is influenced by external factors like events, economic conditions, and competitors. It is important for revenue management and can be analyzed using data on rooms occupied, cancellations, no-shows, and turned away customers from previous years. Booking pace indicates when customers make requests and varies by customer type. It relates to demand and informs key revenue management decisions like implementing restrictions if ahead of pace or offering discounts and value adds if behind pace.