A custodial wallet is a crypto wallet that gives the user the right to self-custody i.e., the user controls the private keys.
Cold wallets are those crypto wallets that rely on separate hardware to run and can be switched off when not in use.
A crypto custodian is an entity responsible for holding and securing digital assets such as Bitcoin, Ethereum, and other cryptocurrencies on behalf of individuals or institutions.
A cryptocurrency is a digital currency issued on a blockchain that can be exchanged for goods and services like a normal currency.
Coins are native to their respective blockchains, while tokens operate on secondary blockchains, often leveraging smart contracts or bridging mechanisms to facilitate their transfer and usage.