It used to be that organizations had individual clouds for their marketing and sales efforts as a way to pull together data, with each cloud holding information for just one area of the company. But just like the customer journey is changing, so too is how we manage it. The big push now is the experience cloud, which brings together things like customer data, digital experience, and personalization to create an efficient, modern way to monitor and interact with customers.
https://www.forbes.com/sites/blakemorgan/2017/10/26/what-is-the-customer-experience-cloud/#1aaae33d1890/