Zero-trust, explained simply

Trust nothing, verify everything

The old model of security was a castle with a moat: get inside the network and you were trusted. The problem is obvious in hindsight — once an attacker is in, they can move freely.

Zero-trust throws that idea out. Every single request has to prove who it is and what it is allowed to do, whether it comes from the other side of the world or the machine next door.

What it means for you

In practice you never have to think about it. Encryption is always on, permissions are checked on every call, and access is granted narrowly and briefly. Security stops being a feature you configure and becomes the ground everything stands on.