Journey Builder is a tool that allows marketers to create personalized, cross-channel customer journeys based on real-time behavior and data. Journey Builder can integrate with Salesforce CRM and other systems to update records based on customer actions. For example, a marketer can use a Salesforce Data Event to trigger a journey when a customer registers for an event, and then use a Salesforce Data Update Activity to update the customer's RSVP status when they click a button in the confirmation email