Interactive click modelling, sometimes called a functional prototype or coded prototype, involves building a working digital representation of a design using code, allowing users to interact with a realistic simulation of the final product. Unlike click dummies that swap static screens, interactive click models respond dynamically to user input, validate form entries, animate transitions, and simulate data states. They are the highest-fidelity form of pre-production prototype and are used when the realism of interaction matters more than speed of iteration.