Priceline is an online travel agency that allows users to book flights, hotels, rental cars, and vacation packages at discounted prices. Customers can name their own price for certain services, allowing them to potentially save money on their travel expenses. Priceline also offers a variety of deals and promotions to help travelers find the best prices for their trips. With a user-friendly website and mobile app, Priceline makes it easy for customers to plan and book their travel arrangements with ease.