Glossary
Wallet
A crypto wallet is a tool that stores the private keys needed to access and control digital assets on a blockchain. It does not hold coins directly — it holds the keys that prove ownership and authorize transactions.
Close-up: A wallet is best understood as a keychain, not a container. On a blockchain, assets live on the network itself; what a wallet manages is the private key — the secret that authorizes spending — and the public key or address that others use to send you funds. Signing a transaction with the private key proves ownership without ever exposing the key itself. Wallets come in several forms: software wallets (apps on a phone or computer), hardware wallets (dedicated offline devices), and paper backups of a seed phrase.
Wide shot: Wallets fall into two broad categories. A custodial wallet leaves key management to a third party, such as an exchange, trading convenience for reliance on that party. A non-custodial (self-custody) wallet puts the keys entirely in the user's hands — full control paired with full responsibility. This is the origin of the well-known principle that whoever controls the keys controls the assets.
Because access depends on the private key or its seed phrase, backing up and safeguarding that secret is the core discipline of using a wallet. Lose it and the funds may be unrecoverable; expose it and anyone can move the assets. Wallets are informational infrastructure, not investment advice — understanding how they work is a matter of security literacy. Always do your own research.