As said before, user story is a concise description of a user need of the product (that is, a requirement) from that user's point of view. User story seeks to describe this need in a simple, lightweight way. Widely used as part of agile methodologies such as scrum, one of the principles behind user stories is that the product could be fully represented through the needs of its users.
The most traditional way to use user stories is in the product backlog as an input and write them on post-it notes, one per post-it. Some teams usually print cards with the skeleton of the user story in it, not to forget any of the three pieces of central information, and even with other fields such as the number of points ...
