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Data Source Creation in Contact Builder
Data Sources establish where the data contained within Contact Builder originates. You can assign attributes to these data sources and view precisely how data enters your account and how you can best use that data.
Contact Builder includes synchronized and custom data sources. Synchronized data sources enable access to data from other Salesforce clouds. Custom data sources help you identify other external sources of data.
Use the Data Extension screen to access and manage data extensions within Contact Builder.

