User stories are a few sentences in simple language that outline the desired outcome. They don't go into detail. Requirements are added later, once agreed upon by the team. Stories fit neatly into agile frameworks like scrum and kanban. In scrum, user stories are added to sprints and "burned down" over the duration of the sprint.Estimation‧Epics, Stories, Themes‧Workflow‧Learn Issues With Jira Software‧Agile Manifesto‧Scrum.