Reference data can be defined as information that is used to provide context or support to other data. This type of data is often used in a database or information system to ensure consistency and accuracy of the data being used. Synonyms for reference data include metadata, supporting data, lookup data, master data, and static data. Metadata refers to data that describes other data, and can be thought of as data about data. Supporting data is information that helps support a particular process or function. Lookup data is used to look up information in a database or information system. Master data refers to information that is considered critical to an organization. Static data is data that does not change frequently.