We all know someone who still manages to confuse "the internet" and "the World Wide Web", and no amount of frustrated, rambling description seems to help them understand the difference. Now, you can just show them this video.
This explainer by TED-Ed describes the World Wide Web as a city, where skyscrapers are web servers, websites are rooms within them, and addresses are, errr, addresses. It's super simple—and could just help your friends, or young children, understand the difference between the 'net and web. [TED-Ed]