What Do Data Centers Do? Explained in Plain English
Every time you send a message, stream a video, check your bank balance or ask an AI a question, a building full of computers somewhere does the actual work. That building is a data center. Here's what happens inside — with no jargon.
The one-sentence answer
A data center is a building full of powerful computers (servers) that store the internet's information and do its computing — everything your phone and laptop are too small to do themselves.
What's physically inside
- Servers, by the thousand — stacked in racks, running the apps, websites and AI models you use.
- Storage — the photos, videos, documents and databases of the digital world live on drives here, usually copied several times for safety.
- Networking — fibre-optic cables connect the servers to each other and to the outside world at enormous speed.
- Power systems — substations, batteries and generators so the computers never lose electricity, even in a blackout.
- Cooling — nearly every watt a server uses becomes heat, so a huge share of the building exists just to remove it.
- Security — fences, guards, cameras and access controls; your data is worth protecting.
What data centers actually do all day
Serve websites & apps
When you open any app, a server in a data center receives the request, looks up your data and sends the answer back — usually in milliseconds.
Store everything
Your cloud photos, emails and backups aren't "in the cloud" — they're on physical drives, in these buildings, copied across several sites so one failure loses nothing.
Stream video
Films and videos are stored and pushed out from data centers positioned near viewers so playback doesn't stutter.
Run AI
Training and answering AI models takes racks of specialised chips — the newest, most power-hungry job in the building. More on AI data centers →
How big is this industry?
Our live map tracks 1,758 facilities across the US and Canada — from single buildings to campuses the size of towns. Virginia alone has 389 of them. Globally, these buildings consumed about 415 TWh of electricity in 2024 — roughly 1.5% of all the electricity on Earth (IEA) — see our sourced power breakdown.
📍 See every data center near youWhy we need them →
Learn the rest
What is an AI data center?
How the AI era changed the buildings themselves.
What is a hyperscale data center?
The giant campuses behind the big clouds.
What is a colocation data center?
The rent-a-rack business most companies actually use.
How do data centers make money?
The business model, in plain English.
Are data centers dangerous?
The honest answer to the neighbourhood question.
Data center jobs
The careers inside the boom — most need no degree.
Frequently asked questions
What is a data center in simple terms?
A building full of powerful computers that store the internet's information and do its heavy computing. When you use an app, stream a video or ask an AI a question, computers in a data center do the actual work and send the result to your device.
What is the purpose of a data center?
To keep digital services running 24/7: hosting websites and apps, storing data safely in multiple copies, streaming media, and running AI. They exist because your phone and laptop are far too small to do this work themselves.
What is inside a data center?
Thousands of servers in racks, high-speed fibre networking, storage drives, massive power systems (batteries and backup generators), industrial cooling, and layers of physical security.
Who owns data centers?
Two groups: hyperscalers like Amazon, Google, Microsoft and Meta that build for their own platforms, and colocation companies like Equinix and Digital Realty that rent space to everyone else. See our company profiles for the top 15 operators.