Welcome to the MapsterEdit
Your JIRA project tends to become a jungle when you start to use it extensively - you plan your project, explore risks, enter, prioritize stories, run sprints, commit your code, test, deploy. Many of these events will be represented by JIRA issues - and the relations, dependencies are just becoming impossible above a certain size.
Mapster helps you with exactly this - you can have a graphical "bird-eye view" on your project, you can trace dependencies and relations in a visual way, and establish these relationships with simple drag-and-drop instead of searching issues by ID each time.
Mapster is your high-tech electronic map in your jungle.