A Bitcoin wallet is software or hardware that manages the cryptographic keys proving you own your Bitcoin. There are two broad categories worth understanding. Hot wallets are connected to the internet - apps like Trust Wallet or exchanges' built-in wallets. They are convenient for regular transactions but carry more exposure to online attacks. Cold wallets store your keys completely offline on dedicated hardware devices like a Ledger or Trezor. They are harder to use day-to-day but dramatically safer for large long-term holdings. The core principle the community lives by is simple: if a third party holds your keys, they hold your Bitcoin.
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