---
schema_version: "1"
id: da4a9ba09dcb8c1316bbfa54cb9551181c75913223ae708860c6258fbbee5995
title: Data Source Creation in Contact Builder
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/mktg/264-0-0/mc_cab_create_data_sources.md
canonical_url: https://help.salesforce.com/s/articleView?id=mktg.mc_cab_create_data_sources.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 778f4685316ad47920f7dcf5479914dc47aef70b0bed32062242c15752f064ed
description: 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.
products:
  - Marketing
  - Marketing Cloud Engagement
release: "264"
---
# 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.

#### See Also

- [Create Synchronized Data Sources in Contact Builder](https://help.salesforce.com/s/articleView?id=mktg.mc_cab_creating_and_interacting_with_synchronized_data_sources.htm&release=264.0.0&type=5 "After you integrate Marketing Cloud Connect and link a data source in Contact Builder, your synchronized data source appears in the Data Sources section. This process takes some time to complete.")
- [Create Custom Data Sources in Contact Builder](https://help.salesforce.com/s/articleView?id=mktg.mc_cab_creating_and_interacting_with_custom_data_sources.htm&release=264.0.0&type=5 "Follow these steps to create custom data sources in Contact Builder.")