Hi @john john Pter,
Content types are defined for a site, and apply at that site and its subsites. But sometimes, you want to use a particular content type on multiple sites, or across site collections. For example, your organization might use a standard template for documents that requires standardized metadata. Because you want all users in the company to use this content type for documents, it is good candidate to publish across all site collections. Or, perhaps the engineering department creates a content type for design specifications, and wants to publish it to just the engineering site collections.
Because content types include metadata, content types and metadata are very closely linked. A Managed Metadata service in SharePoint makes it possible to publish a content type to the sites where it is used. Sites and site collections that are part of the Managed Metadata service are called “subscriber sites”.
A Managed Metadata service must be explicitly created and configured. To include content type publishing, the administrator specifies a specific site collection as a hub. Connected applications and site collections can subscribe to the content types on the hub. By configuring Managed Metadata services, you make it possible to centrally manage content types. Content types are created at the hub site, and any updates can be automatically distributed to the subscriber sites.
See Publish a content type from a content publishing hub for more info on publishing content types.
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