There are some similarities between restaking and liquid staking. For instance, both approaches can be seen as offering staking efficiency – you can do more with your stake. With liquid staking you can take your liquid staking token (LST) and engage in other areas of DeFi, for instance. You can loan out your staked ETH or deposit it in an automated market maker pool and earn rewards. With restaking, you can delegate to an operator and earn additional rewards on your stake. Although risk levels could be similar between the two – the form of restaking risk is closer to the base activity – staking; whereas the risks taken in DeFi with your LST, for instance, is a different kind of risk.