The Linux kernel is what everything else runs on top of, so it's the key to everything that a Linux device can do.
It's in your Android phone. It's in the computers that run the servers at Google, Amazon and all the other web services that we take for granted.
It powers the database that US immigration uses to decide if you are who you say you are, it's deep under the Alps searching for new particles at CERN, and it's even on unmanned drones searching for drugs traffickers in the Caribbean.
Linux is everywhere.
We at Linux Format were lucky enough to speak to Linus Torvalds, the man who wrote the original Linux kernel and still works as its maintainer.
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