data dictionary

A data dictionary is a centralized reference that describes the structure, meaning, and organization of data within a system or database. It includes information such as data types, formats, relationships, and constraints for each data element. Think of it as a detailed catalog or guidebook that helps users and developers understand what data exists, how it is stored, and how to interpret it, ensuring consistency and clarity across the system. This helps prevent mistakes and makes managing data more efficient and reliable.