Wallet

Software or hardware that stores private keys and lets users sign transactions. Custodial wallets (exchanges) hold keys for you. Non-custodial wallets (MetaMask, Phantom, Ledger, Trezor) put you in control. Hot wallets are internet-connected; cold wallets stay offline. Smart contract wallets (ERC-4337) enable features like social recovery and gas abstraction. Wallet choice is the load-bearing security decision.