"Complimentary" refers to something that is provided free of charge. This term is often used in various contexts, such as hotels offering complimentary breakfast or airlines providing complimentary snacks during flights. The idea is to enhance customer experience without any additional cost. In many cases, complimentary items or services are used as marketing tools to attract customers. For example, a restaurant might offer complimentary appetizers to encourage patrons to try their menu. Similarly, hotels may provide complimentary toiletries to enhance guest satisfaction and encourage repeat visits.