What component of the ServiceNow infrastructure defines every table and fieldin the system?

In ServiceNow, theDictionaryis the component that definesevery table and fieldin the system.

Itstores metadataabout every table and field.

It contains details likedata type, field properties, default values, and relationships.

It is managed through thesys_dictionarytable.

If you navigate toSystem Definition > Dictionary, you can view and edit field properties for any table.

The Dictionary defineswhether a field is mandatory, read-only, or referenceable.

A. Data Atlas– Not a valid ServiceNow concept.

B. Table Class Manager– Managestable extensions and inheritance, but does not define individual fields.

C. Schema– Refers to theoverall structure of a database, but in ServiceNow, theDictionarymanages table and field definitions.

E. Field Map– Used fordata imports and transformations, not for defining tables and fields system-wide.

ServiceNow Dictionary Overview

ServiceNow CSA Training Module:"Understanding Tables and Fields"

What is the Dictionary in ServiceNow?Example:Why Other Answers Are Incorrect:References from Certified System Administrator (CSA) Official Documentation: