Server
Say it like this
A computer that stores information and sends it when another computer asks.
For the grown-up
A server is a computer that waits for requests. When you open a website, your browser asks a server for the page. The server sends the page back, and the browser shows it on your screen.
The easy mistake
Careful here. The cloud is not floating in the sky. It is somebody else's computers in real buildings, usually with very good air conditioning.
The full explanation
What Is a Website?
A glossary entry is the short version. This one has the child explanation, the grown-up explanation, the questions and an activity.
Read itWords next to this one
Computer
A machine that follows instructions very fast and never gets bored of doing the same thing again.
Internet
Computers talking to other computers. All of them, all over the world, all the time.
Website
A group of pages that share one address on the internet.
Network
A group of things connected together so they can pass messages to each other.