A Software wallet is a cold (offline) digital wallet intended for securing digital coins with advanced technology, and it is recommended for long-term storage of a large quantity of coins.
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A Software wallet is essentially an external hard drive (connected via USB to a computer or mobile device) and is immune to all types of attacks: hacking, malware, physical attacks, and more. An example of a popular hardware wallet is the Trezor wallet and the Ledger wallet.