A KVM switch is a device that lets one keyboard, display, and mouse control multiple computers. It sits on the input and display path, so it can switch which machine receives keystrokes and which screen is shown without moving peripherals around.
In cybersecurity, KVMs matter because they sit inside the trust boundary between a person and a system. Defenders use them in labs, server rooms, and recovery setups to manage several machines safely from one console. But any KVM with firmware, storage, or network features can also become a target: a compromised or malicious switch may capture input, inject keystrokes, alter what the operator sees, or expose sensitive sessions. For that reason, organizations should treat KVM hardware like other trusted control infrastructure, with secure sourcing, limited physical access, and careful firmware management.