The Vibe: When someone else (like an exchange) holds and controls your crypto for you.
The Details: A custodial service means you don’t have the private keys—the company keeps them and manages your coins behind the scenes. It’s like a bank account: easy to use, with login/password, customer support, and often insurance, but you have to trust them completely. If the exchange gets hacked, goes bankrupt, or freezes accounts, your money could be at risk. Most big CEXs (like Coinbase or Binance) are custodial by default.
Pro Tip: Custodial is fine for small amounts or active trading, but for serious holdings, move to self-custody (“not your keys, not your coins”). Always enable 2FA and watch for red flags like sudden withdrawal limits.