10 Data Center Terms for Beginners: A Starter Glossary
- Sahil Harwani
- October 2, 2026
- Blog
- 0 Comments
If you’re new to the data-center industry, start with these 10 terms.
I’ve been researching this space a lot lately. Shoutout to @Kaustubh, whose review-call questions have basically become my data-center vocabulary list.
Here’s the shortlist I’d hand to anyone starting from zero, split roughly between the business/infrastructure side and the engineering side.
- MW / GW – Megawatt / Gigawatt
The units used to talk about how much power a data center requires.
Individual facilities are usually discussed in MW, while some of the largest planned AI campuses are now being discussed at GW scale.
- Rack Density
How much power a single server rack consumes, usually measured in kW per rack.
It’s been climbing rapidly with AI workloads, driving changes in power delivery, cooling and data-center design.
- PUE – Power Usage Effectiveness
A metric comparing a data center’s total energy consumption with the energy used by its IT equipment.
Lower is generally better. A PUE of 1.0 means all energy goes directly to IT equipment; highly efficient modern facilities can get close to 1.1.
This was one of those acronyms I kept seeing everywhere before I actually understood it.
- Hyperscaler
Companies such as Google, Microsoft, Amazon and Meta that operate cloud and data-center infrastructure at enormous scale.
- Colocation
Think of it as renting a desk in a shared office, except the “desk” is rack space and the building comes with power, cooling, connectivity and security.
- Powered Land / Powered Shell
Land or a partially developed data-center site where power capacity and key infrastructure are already secured or substantially advanced.
Powered land generally refers to a site where sufficient power capacity is secured or available.
The powered shell typically goes further: the building envelope is complete and energized, but the white space has not yet been fully fitted out with the racks, cooling and other tenant/operator equipment.
- Liquid Cooling
As chip and rack power densities rise, removing heat becomes increasingly difficult with air alone.
Liquid cooling brings coolant closer to the heat source, allowing higher-density computing systems to be cooled more effectively.
- SERDES – Serializer/Deserializer
This one took me the longest to get.
SERDES converts data between parallel and high-speed serial formats, allowing data to move rapidly between chips and systems.
You probably won’t see it in a “data center 101” post, but go one layer deeper into the engineering stack and it comes up constantly.
- Interconnect
Related to SERDES, but not the same thing.
SERDES is a technology used for high-speed serial data transmission. Interconnect is the broader set of technologies and links connecting processors, accelerators, memory and other components.
- Grid Connection
The unglamorous one that turns out to be critical.
A data center can have the land, servers and capital to build, but without a grid connection with sufficient capacity, it can’t operate at the planned scale.
Ten terms down. A few hundred more to go.
What data-center term would you add to this list?
