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A CRUD diagram shows what types of processing is performed on data by a system, indicating them in a matrix format for each function. The types are described as "Create," "Read," "Update" and "Delete," which are the operation types when data is manipulated by a database management system (DBMS). The diagram is called CRUD after the initials of these types.

When the "function to change product name" is employed to change the data recorded as "product name" in the database, for example, a CRUD diagram that places functions in columns and data in rows shows "Update" at the intersection of the "function to change product name" (column) and "product name" (row).

When used in the design process of a system, a CRUD diagram helps verify if there is any lack of certain functions, omission of investigations on the database and concentration of processing tasks, etc.

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