What is DM and CM mismatch?

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I'm reading a paper about differential amplifiers and it talks about DM and CM mismatch and how they affect the CMRR.
I know that input impedance mismatch can limit the overall CMRR, but I don't understand what is meant by DM and CM mismatch and haven't heard of this term before.
 

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DM mismatch refers to imbalances in the differential components or signals. CM mismatch refers to imbalances in the handling of common-mode components or signals. Both types of mismatch degrade the CMRR by reducing the amplifier's ability to reject common-mode signals and accurately amplify differential signals.
 

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