An air gap refers to a security measure where a device is completely isolated from the internet and other networks. This method is often used to protect sensitive information, such as private keys for cryptocurrency wallets.By keeping these devices offline, the risk of hacking or unauthorized access is significantly reduced. Users can store their cryptocurrency on hardware wallets or even paper wallets, which are not connected to the internet at all. To perform transactions, users typically transfer their information to a separate online device temporarily. This approach ensures that the private keys remain secure, as they are not exposed to potential online threats. While air-gapped operations can enhance security, they require careful handling and understanding of the risks associated with transferring data between offline and online environments.