CLV chain uses NPOS (Nominated Proof-of-Stake) as its consensus mechanism, which is the same as Polkadot uses. CLV users can participate in the consensus as nominators.
You may have an account with $CLV and want to stake $CLV to earn more. You could do so as validator, which requires a node running 24/7. If you do not have such a node or do not want to bother, you can still earn $CLV by nominating one or more validators. By doing so, you become a nominator for the validator(s) of your choice.