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.
Key management is the set of practices and systems for creating, storing, using, rotating and retiring cryptographic keys. It keeps encrypted data and digital signatures trustworthy.
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.
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 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.
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.
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