A cold wallet is a type of cryptocurrency storage that is not connected to the internet. This makes it a secure option for holding digital assets like Bitcoin or Ethereum. Cold wallets can come in various forms, such as hardware devices or paper wallets, and are designed to protect against online threats like hacking. Using a cold wallet is ideal for long-term storage of cryptocurrencies, as it minimizes the risk of theft. While accessing funds may take more time compared to online wallets, the added security makes cold wallets a popular choice for serious investors and those looking to safeguard their assets.