A quantity of ndau assigned to an ndau account to be used as a sort of surety bond for ndau validator node operations. “Stake” is also a verb describing the process of that assignment.
RegisterNode has a minimum staking requirement of 1,000 ndau. All of this stake may be forfeited (slashed) as a penalty for poor or malicious node behavior. Stake has a target — the address to which the stake is pledged.