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Contact Builder is where you define how contact data is structured and shared across the account. It sets up the data model that links data from multiple data sources and establishes the All Contacts domain, giving you a unified view of contacts for cross-channel interactions. Data Designer is a part of Contact Builder that handles the relationships between data extensions, but the overarching component that defines the data model and the All Contacts domain is Contact Builder. Journey Builder and Email Studio focus on building journeys and creating messages, not on shaping the data structure or global contact visibility, so they don’t define this concept.