Deep Freeze is a software tool developed by Faronics. It's primarily used to protect computers by locking the operating system, applications, and settings to a specific state. This means that any changes made while the computer is running are lost when it is restarted, returning the computer to its original, "frozen" state. This is particularly useful in environments where public access to computers is provided, such as libraries, labs, and kiosks, to prevent unauthorized changes or damage to the system.