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A non-staking wallet transaction that authorizes an online Super Staker to stake the coins (UTXOs really) for that user. The delegation user does not send their coins (they keep complete control) and only sends permission for the Super Staker to provide staking for that address. Sort of a virtual Solo Staker for the user.
A replay attack is a form of network attack when valid data transmission is fraudulently intercepted, then delayed or resent to mislead the receiver into doing what the hacker wants.