A data catalog is a centralized repository that helps organizations manage and organize their data assets. It provides a comprehensive inventory of data sources, including databases, files, and datasets, making it easier for users to find and access the information they need. By offering metadata, such as data descriptions and usage guidelines, data catalogs enhance data discovery and understanding. Data catalogs often include features like search functionality, data lineage tracking, and user collaboration tools. They support data governance by ensuring that data is properly documented and maintained. Popular tools for creating data catalogs include Apache Atlas and Alation.