A data catalog (data catalog) is a central storage point for metadata all data within an organization. It is used to store information about available data sources, structures, formats and the relationships between different data sets.
A data catalog can help data analysts and other data users within an organization discover and understand the data available within an organization and find the data relevant to their needs.
It can also help ensure that data is properly managed by providing a clear overview of how data is used and by whom.
A data catalog can be an important tool for improving the efficiency and effectiveness of data analytics within an organization.
An example
Below is an example of a data catalog that can be securely accessed and searched within an organization using Microsoft Purview:

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