The Contact Key is the unique identifier that unifies a customer across multiple channels in Salesforce Marketing Cloud. It is used as a central reference to manage customer data across all Marketing Cloud applications, ensuring that all interactions, regardless of channel, are tied back to the same individual.
* Why Contact Key is Essential: Unlike Subscriber Key, which is specific to Email Studio, the Contact Key is used across all channels, including Email Studio, Mobile Studio, and Journey Builder. This allows for a cohesive, cross-channel customer experience.
* Salesforce Documentation Reference: Refer to the Salesforce Marketing Cloud Contact Model documentation for detailed information on Contact Keys and their role in unifying customer data.