virsh vcpu_period and vcpu_quota

I have been looking into ways to divide my CPU amongst KVM guests other than by just setting vCPU access limits. I understand the concept of cpu_shares which can be set/displayed with virsh schedinfo, but I also found vcpu_period and vcpu_quota listed with this command as shown below:

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Looking at the man page, I know what the acceptable input values are but could somebody please explain in simple terms what these two parameters actually do?

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