What is the significance of creating a CRM API User account?

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Having a CRM API User account creates a dedicated integration identity that links Marketing Cloud to your CRM org. This user is the account under which all API activity from the integration runs, so the CRM sees a single, auditable bridge rather than ad-hoc calls from individual users. By tying the Marketing Cloud Connect setup to this dedicated user, you can enforce precise permissions through a specific Salesforce profile or permission sets, enabling secure, controlled data exchange. It supports reliable bidirectional data sync because Marketing Cloud can read and write CRM records (as allowed by the integration), which is essential for syncing contacts, leads, activities, and other data used in campaigns and journeys. It also simplifies monitoring and troubleshooting since API traffic can be traced to this integration user, providing a clear ownership trail. Not every scenario relies on this for MFA or read-only access, and making the integration optional would break the reliable connection between the systems.