Too Long; Didn't Read
Have you ever thought of what a user would do with your application?
No matter how well-architectured the app you built is, if it brings no value to users, chances are, no one will use it.
In simple terms, user stories are brief, informal descriptions of a software feature told from the perspective of the users. These answer the "who," "what," and "why" of a single task/functionality in an application.