Online marketplaces are websites or apps where people can buy and sell goods and services. They connect buyers and sellers, making it easy to find a wide variety of products, from clothing to electronics. Popular examples include Amazon and eBay, where users can browse listings, compare prices, and read reviews before making a purchase. These platforms often provide a secure payment system and customer support, ensuring a smooth shopping experience. Sellers can reach a larger audience without needing their own website, while buyers benefit from the convenience of shopping from home. Overall, online marketplaces have transformed the way we shop.