Some nice explanations by Google Privacy people of terms like HTTPS and VPN can be seen at Digital Inspiration's really useful site. When I viewed this on YouTube I found a whole pile of others too. Well worth a look if you're either teaching or studying this sort of thing and need simple, Plain English (well nearly), tutorial material.
Not too sure about this young lady's pronunciation of S but once the novelty wears off you'll stop giggling and learn something!
