A travel reservation engine is a software system that facilitates the booking of travel services such as flights, hotels, and car rentals. It works by processing user requests, querying databases, and providing booking options.

When a user makes a booking request, the reservation engine processes this request by querying various databases and systems to retrieve available options for flights, hotels, or car rentals.

The engine then presents the available options to the user, allowing them to select and book their preferred choice. The system handles all necessary transactions and updates inventory in real-time.

Integration with other systems, such as payment gateways and supplier databases, ensures that the booking process is seamless and accurate. The engine also manages booking confirmations and updates to ensure a smooth user experience.

Overall, a travel reservation engine streamlines the booking process by processing user requests, querying databases, and integrating with various systems to provide accurate and efficient travel bookings.