Online catalogs are digital collections of items or services that can be browsed and searched through the internet. They are commonly used by businesses, libraries, and educational institutions to showcase their products, books, or resources. Users can easily access these catalogs from anywhere, making it convenient to find information quickly. These catalogs often include images, descriptions, prices, and availability of items. Many online catalogs also allow users to filter results based on specific criteria, such as category or price range. Examples of online catalogs include those found on e-commerce websites like Amazon or library systems like WorldCat.