Beginners often blur wallets and exchanges together, but they play different roles, and knowing the difference is key to using crypto safely.
An exchange is a marketplace. It is where you convert regular money into crypto, trade one coin for another, and cash back out. When you keep crypto in your exchange account, the exchange typically holds the keys on your behalf, much like a bank holds your money. That is convenient but means you are trusting the exchange.
A wallet is a tool for holding and controlling crypto yourself. A self-custody wallet gives you the private keys, meaning you, and only you, control the funds. It is less about trading and more about ownership and storage.
A helpful analogy: the exchange is like the currency booth where you change and trade money, while a self-custody wallet is like your own personal safe. Many people use both, trading on an exchange and moving longer-term holdings into a wallet they control, capturing the phrase: not your keys, not your coins.
