# Client-Server Model

Yesterday we said cloud computing means renting servers instead of owning them. But renting from who — and how does your device actually reach one?

On the internet, every request travels from one device to another. There are two roles: a **client** — you, sending the request — and a **server** — the one receiving and responding.

Think of ordering food. You (the client) place an order — that's the request. Thirty minutes later, a delivery person (the server) brings your food — that's the response. The request is *asking*, the response is *getting*.

This whole exchange is called the **Client-Server Model**. Under the hood, it involves how requests actually travel, and which protocols and methods carry them — we'll get there.

This is the exact structure my own project runs on: my frontend sends the request, and my backend on EC2 acts as the server, receiving it and responding back.

**Takeaway:** every website you visit is just a conversation — client asks, server answers.

Tomorrow: how does your phone know exactly which server, out of millions on the internet, to talk to? That's networking — see you then.