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Primarily focuses on hotel bookings, but also offers flights, car rentals, and other travel services.  Known for its wide selection of accommodations and user-friendly interface.  Often has competitive pricing and deals.

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A metasearch engine, meaning it searches across multiple travel websites including the others listed here to find the best deals on hotels.  It doesn't directly book travel; instead, it redirects users to the booking site with the best price.  Useful for comparing prices across different platforms.

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Similar to Booking.com, Hotels.com focuses on hotel bookings but also provides options for flights and packages. It's known for its rewards program, where users earn a free night after staying ten nights.

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A comprehensive travel booking site offering flights, hotels, car rentals, activities, and vacation packages.  Provides a one-stop shop for planning various aspects of a trip.

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Another metasearch engine, like Trivago, Kayak searches various travel websites to compare prices for flights, hotels, and rental cars. It also offers tools to track price changes and find the best deals.

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The five websites offer overlapping but distinct features. Booking.com and Hotels.com are direct booking sites focusing on hotels, while Expedia.com offers a more comprehensive range of travel services. Trivago.com and Kayak.com are metasearch engines that compare prices across multiple booking sites.  The best choice depends on individual needs and preferences.  For example, if you are looking for a wide selection of hotels and a user-friendly interface, Booking.com might be a good choice. If you need to compare prices from many sites at once, Trivago or Kayak would be more suitable.