Delegation is the process of contributing digital assets to Avely Finance smart contract which will be able then to redelegate them to Zilliqa staking smart contract for a user.
Zilliqa staking smart contract allows to change a delegator. Users can delegate their ZIL to Avely Finance smart contract without withdrawing their funds.
Liquid staking is an act of delegating user's assets to a service which stakes them for the user. In return this user gets bonded assets which can be used the same way as native assets and thus bring flexibility and liquidity to staked funds. Bonded assets can be always replaced back to native assets.