Spring Web Flow facilitates building web applications that require guided navigation -- e.g. a shopping cart, flight check-in, a loan application, and many others. In contrast to stateless, free-form navigation such use cases have a clear start and end point, one or more screens to go through in a specific order, and a set of changes that are not finalized to the end.A distinguishing feature is the ability to define a flow definition consisting of states, transitions, and data. For example, view states correspond to the individual screens of the flow while transitions are caused by events resulting from the click of a button or a link. Data may be stored in scopes such as flash, view, flow, and others. Scoped data is cleared when it is no longer in scope.