A data dictionary is a data structure that stores metadata, i.e. (structured) data about information.
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Metadata
Metadata is data that describes the scope and features of some data (e.g. author, topic, language, year of publication, access rights), without touching on the content of the data.
Data governance is a data management concept concerning the capability that enables an organization to ensure that high data quality exists throughout the complete lifecycle of the data, and data controls are implemented that support business objectives.
In computing, a data warehouse (DW or DWH), also known as an enterprise data warehouse (EDW), is a system used for reporting and data analysis and is considered a core component of business intelligence.