Complimentary service refers to a type of service provided at no additional cost to the customer. This can include perks such as free meals, drinks, or amenities offered by businesses like hotels, airlines, and restaurants. The goal is to enhance the customer experience and encourage loyalty. Businesses often use complimentary services as a marketing strategy to attract new customers or retain existing ones. For example, a hotel might offer complimentary breakfast to guests, while an airline may provide free snacks during flights. These services can create a positive impression and encourage repeat business.