A crypto wallet is software or hardware that stores the keys used to control digital assets such as cryptocurrency, NFTs, or tokens. The wallet itself does not usually hold the coins; it manages the private keys, seed phrases, and signing functions that prove ownership and authorize transactions.
Crypto wallets matter in cyber security because whoever controls the keys controls the assets. Attackers often target wallets through malware, phishing, clipboard hijacking, fake apps, browser extensions, or by stealing backups and recovery phrases from compromised endpoints. In high-value environments, a stolen wallet file or seed phrase can let an intruder transfer funds immediately and irreversibly. Defenders reduce risk by isolating signing devices, using hardware wallets, protecting recovery phrases offline, limiting browser exposure, and monitoring systems for unexpected access to wallet-related files or transaction signing prompts.