what is .NET Host and why is it absolutely hogging my CPU and multiplying itself

[Microsoft Windows]

My performance is running really bad because of it, and I'm getting constant lag spikes. Most of the time, I get an absolute abundance of lag. I've tried closing other processes I don't need, but the .NET Host just makes more of itself and kills my CPU. I'm also scared to close it because I don't know if it's important or something.

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