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 custodial wallet leaves the private keys with a third party such as an exchange, while a non-custodial wallet puts them in the user's hands. That choice decides who can move funds, who carries the risk and who must meet regulatory duties.
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 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.
A gas fee is the charge paid to a blockchain network to process a transaction or run smart contract code. It is priced per unit of computation and rises when the network is busy.
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