Comparison websites are online platforms that allow users to compare products, services, or prices from different providers. They help consumers make informed decisions by presenting information side by side, such as features, costs, and customer reviews. Common categories include travel, insurance, and electronics. These websites typically earn revenue through affiliate marketing, where they receive a commission for directing traffic to the companies they feature. By simplifying the research process, comparison websites save users time and effort, making it easier to find the best deals and options available in the market.