As an avid traveler, I've found that online travel agencies are a convenient tool for planning trips. They work by acting as a one-stop shop for your travel needs, whether it's flights, hotels or car rentals. These platforms have partnerships with suppliers to provide a range of options at competitive prices. You simply enter your travel details, compare options, and book your choice directly on their website. Plus, they often offer customer support and extra services like travel insurance or help with visa applications.