Final answer:
The statement is false; datatypes in databases define the kind of data that can be stored, not necessarily the accuracy. Ensuring the accuracy involves further constraints and validation methods.
Step-by-step explanation:
The statement 'A Datatype is a rule used to ensure the accuracy of data stored in a database.' is false. While a datatype does define the kind of data that can be stored in a particular column of a database (such as integers, decimals, text, etc.), it is not a rule that ensures the accuracy of said data. Instead, datatypes help to define how data can be processed and stored and the kind of operations that can be performed on that data. Ensuring data accuracy involves additional constraints and validation methods, such as foreign keys, unique constraints, checks, and triggers, which enforce the correctness of the data in relation to the domain and business logic.