An IC catalog is a comprehensive database that lists various integrated circuits (ICs) available in the market. It provides essential information such as specifications, features, and pin configurations, helping engineers and designers select the right components for their electronic projects. These catalogs can be found online or in printed form and often include filters to narrow down searches based on parameters like voltage, package type, and manufacturer. By using an IC catalog, users can efficiently compare different ICs and make informed decisions for their designs.