A database is a structured collection of data that is organized and stored in a way that allows for efficient retrieval, updating, and management. It serves as a central repository for storing and managing data, making it easy to access and manipulate information for various purposes. Databases can range in size from small, personal databases to large, enterprise-level databases that store vast amounts of data. They are commonly used in businesses, organizations, and applications to store, organize, and analyze data for decision-making and operational purposes. Databases are essential for data-driven processes and play a crucial role in modern information technology systems.