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Explanation/Reference:
Note: Consistent use of metadata The managed metadata features in SharePoint products enable you to control how users add metadata to content.
For example, by using term sets and managed terms, you can control which terms users can add to content, and you can control who can add new terms. You can also limit enterprise keywords to a specific list by configuring the Keywords term set as closed.
When the same terms are used consistently across sites, it is easier to build robust processes or solutions that rely on metadata. Additionally, it is easier for site users to apply metadata consistently to their content.