Prototypes are draft versions of products being used for exploring the ideas, demonstrating design concepts, helping communication, and gathering feedbacks. A prototype can be a low-fidelity one made from paper drawings, or a high-fidelity one which is close to the real product from a user's perspective.
Here are a few prototypes I created for mobile apps BEEN and BingoTrip. These prototypes helped me validate user interfaces and interactions. They were also used in usability testings.
Made with POP. To start interacting with the prototype, click/tap the icon 'Been' on the screen.
Made with Justinmind. This video is a screencast of interacting with the prototype.