UX design begins by learning about the business model, doing user research and understanding how a service can fit into the users’ lives in a meaningful way. Thus UX design has a crucial part in defining the business strategy, providing baselines for business decisions with such design deliverables as personas or user stories. A UX-driven process doesn’t end with the UIs either, it’s also about testing with people, supporting development, making ongoing adjustments even after the launch.

https://uxmyths.com/post/3897350094/myth-31-ux-design-is-a-step-in-a-project