Online retailers are businesses that sell products or services over the internet. They allow customers to browse and purchase items from the comfort of their homes, often providing a wide range of products, from clothing to electronics. Popular examples of online retailers include Amazon, eBay, and Walmart. These retailers typically operate through websites or mobile apps, offering features like product reviews, secure payment options, and home delivery. Online shopping has become increasingly popular due to its convenience, allowing consumers to compare prices and find deals easily without visiting physical stores.