The Internet Is Everywhere — But What Is It, Really?

You use the internet dozens of times a day, but have you ever stopped to wonder what's actually happening when you type a web address and a page appears? The internet isn't magic — it's an extraordinarily well-engineered system of physical hardware, agreed-upon rules, and clever software working together in milliseconds.

This explainer breaks it all down without the jargon.

At Its Core: A Global Network of Networks

The internet is, quite literally, a network of networks. Millions of computers, servers, smartphones, and other devices are connected to one another — directly or indirectly — via cables, fibre optics, wireless signals, and satellites.

No single company or government owns the entire internet. It's a decentralised system, which is part of why it's so resilient.

IP Addresses: Every Device Has an Identity

For devices to communicate, each one needs a unique address — just like a home needs a street address to receive mail. This is called an IP address (Internet Protocol address). It's a numerical label like 192.168.1.1 that identifies a device on a network.

When you connect to the internet through your home router, your Internet Service Provider (ISP) assigns your connection a public IP address. Your router then gives local IP addresses to your devices internally.

Domain Names and DNS: The Internet's Phone Book

Remembering numbers like 142.250.80.46 for every website would be impossible. That's why we use domain names like google.com. The Domain Name System (DNS) acts as a translator — it converts human-readable domain names into the IP addresses computers understand.

When you type a web address, your device first contacts a DNS server to look up the correct IP address before any webpage content is loaded.

How a Web Page Reaches Your Screen

Here's a simplified sequence of what happens when you visit a website:

  1. You type a URL into your browser.
  2. Your browser asks a DNS server for the IP address of that domain.
  3. Your browser sends a request to the server at that IP address.
  4. The server responds by sending back the files (HTML, CSS, images) that make up the webpage.
  5. Your browser reads those files and renders the page you see on screen.

All of this typically happens in under a second.

Packets: Data Travels in Pieces

Data sent over the internet isn't transmitted as one large chunk. It's broken into small pieces called packets. Each packet travels independently through the network and may take a different route. When they all arrive at the destination, they're reassembled in the correct order.

This packet-switching approach makes the internet efficient and fault-tolerant — if one route is congested or broken, packets simply travel another way.

Protocols: The Agreed-Upon Rules

For all these devices to communicate, they must follow the same rules. These rules are called protocols. Key ones include:

  • TCP/IP: The foundational set of rules governing how data is sent and received.
  • HTTP/HTTPS: The protocol for transferring web pages (HTTPS adds encryption for security).
  • SMTP/IMAP: Protocols used for sending and receiving email.

The Physical Layer: It's Not Just Wireless

Much of the internet runs through physical infrastructure that spans the globe — including thousands of kilometres of undersea fibre optic cables on the ocean floor. These cables carry the vast majority of international internet traffic at the speed of light.

Putting It All Together

The internet is a brilliant combination of standardised protocols, physical infrastructure, and distributed systems. Every time you load a page, send an email, or stream a video, countless processes fire in sequence to make it feel effortless. Understanding the basics helps you appreciate both the technology and how to use it more safely and effectively.