Prototype is an interactive or semi-interactive model used to test layout, flow, and user interactions before development.
It matters because a website is often the first serious evaluation point for a buyer. Good design reduces confusion, builds trust quickly, supports accessibility, and helps visitors take the next step without feeling pushed.
Example
A prototype lets a reviewer select a service, open its details and step through a simulated booking flow. Testing those interactions can reveal a missing back link or confusing choice before the production site is built.