Big databases refer to large and complex data storage systems designed to handle vast amounts of information that traditional databases struggle to manage. These databases are characterized by their ability to process high volumes of data at high velocity and accommodate a variety of data types, including structured and unstructured data. Technologies such as Hadoop and cloud-based solutions enable organizations to store, analyze, and derive insights from big data efficiently. As businesses increasingly rely on data-driven decision-making, understanding big databases becomes essential for leveraging the potential of big data across various industries.