Kayak is a very popular meta-search site made for travel, which means they are essentially a search engine created specifically for travelers.
From flights to hotels, rental cars and more, they scour the depths of the internet to find you all the ways to make your trip happen. These options might include results from online travel agencies (OTAs), discount suppliers, other search engines and the flight/hotel/rental car’s own website. They bring all this information together so you have the details you need to choose what works best for you.