OTP encryption, anyone know more about this

I was looking for a way to use encryption using LUKS for Linux with some acceleration to not slow down the device, but I was told the vim2 has a encryption called OTP, and I haven’t heard of it and find it a bit confusing. I know google has made a new encryption software for devices that don’t have hardware acceleration called Adiantum, which apparently is in Linux kernel 5.0, but anyway what is OTP, does it use Cpu for encryption or does it only store keys and use cpu for encryption or does it do AES on it.