Simple explaination of Wordress

Hi

I have just started using WordPress in the last couple of months, and have been searching online for a diagram that explains WP in very simplistic terms. Most things I’ve found have got too detailed. I have put together a diagram to help me explain it to someone who has never encountered WP before and doesn’t have a techy background. I think this is about as simple as I can get, I would welcome comments if anyone feels there is anything significantly missing or if anyone knows of a similar better diagram out there.

Thanks

Jim..