How the Internet Works
A "cloud" that, underneath all the wireless-feeling convenience, ultimately runs through physical fiber-optic cables laid across the ocean floor.
Cheat Sheet
- The internet is a global network of interconnected computer networks, all communicating using a shared set of standardized rules called protocols.
- Data sent over the internet is broken into small packets, each routed independently across the network and reassembled at its destination — not sent as one continuous stream.
- IP addresses function like postal addresses for devices, uniquely identifying each device on a network so data knows where to go.
- The Domain Name System (DNS) translates human-readable website names (like example.com) into the numerical IP addresses computers actually use to locate each other.
- No single company or government owns or controls the internet as a whole — it operates as a decentralized network of independently operated networks agreeing to interconnect.
- Physical infrastructure — including undersea fiber-optic cables carrying data between continents — underlies even purely wireless-feeling internet activity like cloud storage or video calls.
The 60-Second Version
The internet is a global network of interconnected computer networks, all communicating using a shared set of standardized rules called protocols. Data sent over the internet is broken into small packets, each routed independently across the network and reassembled at its destination, not sent as one continuous stream. IP addresses function like postal addresses for devices, uniquely identifying each device on a network so data knows where to go. The Domain Name System, or DNS, translates human-readable website names like example.com into the numerical IP addresses computers actually use to locate each other. No single company or government owns or controls the internet as a whole — it operates as a decentralized network of independently operated networks agreeing to interconnect. Physical infrastructure, including undersea fiber-optic cables carrying data between continents, underlies even purely wireless-feeling internet activity like cloud storage or video calls.
The Long Version
The Network of Networks
The internet isn't a single unified system but rather a vast collection of independently operated networks, run by internet service providers, universities, governments, and companies, all agreeing to interconnect and communicate using the same shared set of standardized protocols. This decentralized structure is a big part of why no single entity can simply "shut off" the entire internet.
How Data Actually Travels
When you send anything over the internet, whether a message, an image, or a video stream, it gets broken down into small units called packets before transmission. Each packet travels independently, potentially via different physical routes across the network, and gets reassembled in the correct order once it reaches its destination, a system designed to make the network more resilient and efficient than sending one continuous stream of data.
Addresses and Names: IP and DNS
Every device connected to the internet is assigned an IP address, a unique numerical identifier that functions much like a postal address, telling the network exactly where to deliver data. Since remembering long strings of numbers isn't practical for humans, the Domain Name System translates familiar website names into their corresponding numerical IP address behind the scenes, entirely invisibly to the average user.
The Physical Infrastructure Behind "The Cloud"
Despite feeling wireless and immaterial, especially when people describe things as being stored "in the cloud," an enormous amount of real physical infrastructure underlies the internet, including a global network of undersea fiber-optic cables that carry the vast majority of intercontinental internet traffic, along with massive physical data centers housing the servers that actually store and process our data.
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Glossary
- Packet
- A small unit of data that internet traffic is broken into for transmission, reassembled at its destination.
- IP address
- A unique numerical identifier assigned to each device on a network, used to route data to the correct destination.
- DNS (Domain Name System)
- The system that translates human-readable website names into the numerical IP addresses computers use.
- Protocol
- A standardized set of rules that allows different computers and networks to communicate with each other.
- ISP (Internet Service Provider)
- A company that provides individuals and organizations with access to the internet.