What is Cronus Zen in Modern Warfare 2 -- Explained

Some Modern Warfare 2 players use a Cronus Zen to gain an advantage over their opponents. But what is the Zen and is it safe to use?
Is the Cronus Zen okay to use or should you avoid it?

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Call of Duty players will now be banned for using Cronus hardware

Let's talk about Cronus Zen : r/ModernWarfareII

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CRONUS ZEN Warzone 2 Extra Aim Assist Explained for Beginners

What a Cronus Zen is used for in Warzone 2 & MW2, explained

People accuse me of using Cronus. Here's how to control recoil. : r/ modernwarfare

Bad news, Warzone 2 players: the Cronus still works, and it's ready to make your life hell

Bold move by Call of Duty! Cheaters will get a shock if they exploit aim assist via XIM, Cronus Zen, ReaSnow S1