Trip-planning services are online services that allow travelers to research and purchase their travel arrangements. Typically, travelers can search for hotels, flights, cruises, or rental cars, as well as compare prices or find special offers. Some services may also offer additional features such as travel advice, itinerary planning, or even assistance in booking activities or services. Trip-planning services can make it easier for travelers to find the best deals on their trips, as well as research and book their own travel arrangements.