A smart wallet is a crypto wallet that is itself a smart contract. Because its rules are code, it can offer recovery without a seed phrase, spending limits, batched actions and sponsored gas.
An MPC wallet is a crypto wallet whose private key is never held in one place. Several parties each keep a key share and sign together, so no single device, person or server can move funds alone.
A Web3 wallet is an app or device that holds the keys to a user's blockchain accounts and signs transactions. It lets people hold assets and connect to decentralised applications under their own control.
Account abstraction turns a blockchain account into a programmable smart contract rather than a single private key. The account's own code then decides how transactions are signed, how access is recovered and who pays the fees.
A multisig is a crypto wallet that needs approval from several keys before a transaction can go through, such as any three of five signers. It removes the single point of failure of one private key.
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