The Database Development Lifecycle (DBLC) is a structured process for designing, implementing, and maintaining a database system to meet specific organizational needs. It consists of several phases: requirements analysis, where data needs are identified; conceptual design, where data relationships and models are created; logical design, where data structures are refined for the database management system; physical design, involving the implementation of the database on specific hardware and software; implementation, where the database is developed and populated with data; and testing, deployment, and maintenance, ensuring functionality, performance, and updates as needed. This lifecycle ensures systematic development, scalability, and efficient data management.