What happens when I upload a photo?

When you upload a photo to the the BBC Weather Watchers site, you’re not just on the internet – you're part of it. But what is the internet?

The internet is a vast network of millions of computers and devices, all connected to each other. When you go online your computer joins this network, and you connect to the BBC via some of these other computers.

Here's what happens when you post a photo to the BBC Weather Watchers site – all within milliseconds.

Now find out about what you send – the data you can see and the data you can't.