Glossary
What is a custodial wallet?
In one sentence
A custodial wallet is one where a company holds the private keys for you — like an exchange balance. Convenient, but you are trusting them.
When you buy crypto on most exchanges and leave it there, you have a custodial arrangement. The company controls the keys; your balance is an entry in their database representing what they owe you.
The advantages are real. You cannot lose your funds by losing a phrase, password recovery exists, and support can help when something goes wrong. For someone new, that safety net genuinely prevents a category of permanent mistakes.
The risk is that you are exposed to the company. If it is hacked, becomes insolvent, freezes withdrawals or is ordered to freeze your account, your crypto is affected regardless of what the blockchain says. Several large custodians have failed, and customers became unsecured creditors in a bankruptcy.
If you use one, favour platforms with a long operating history, meaningful regulatory standing in your jurisdiction and published proof-of-reserves — and enable two-factor authentication with an app rather than SMS.
For example
Leaving a small trading balance on a reputable exchange is a reasonable convenience; leaving your long-term savings there is a different decision.