A use case describes the interaction between a user and a system to achieve a goal. Use cases can be used during the UX design and QA phases of the SDLC.
![Sky Cannoe Use Case [classic] | Creately](https://i.pinimg.com/originals/03/83/06/038306a686cfce97ac39eb10511e4f87.png)
![Diagrama de casos de uso para el sistema de citas médicas en línea. (es) [classic] | Creately](https://i.pinimg.com/originals/33/30/e2/3330e2fbaf46d28a69fe7f91b3cb9423.png)
