A Booking Engine is an online tool that allows customers to search for and reserve services such as flights, hotels, or rental cars. It simplifies the booking process by providing real-time availability, pricing, and options, enabling users to make informed decisions quickly. These engines are commonly used by travel agencies, hotels, and airlines to manage reservations efficiently. They often integrate with other systems, such as payment gateways and customer relationship management (CRM) software, to streamline operations and enhance the user experience. Popular examples include Expedia, Booking.com, and Airbnb.