A story map is a tool that visualizes features representing a workflow. A story map is a two-dimensional arrangement of user stories that shows the relationship between the user activities and the features that support them1. A story map helps the team to understand the user journey, prioritize the features based on value and dependencies, and plan the releases and iterations2.
References:
*Story Mapping - Scaled Agile Framework
*What is User Story Mapping? | Definition and Overview