Security is measures taken to protect against malicious activity.
In the realm of cryptocurrencies, security refers to the measures taken to protect digital assets and related technology from unauthorized access, theft, and damage. This includes not only securing the blockchain network itself but also individual wallets, exchange platforms, and smart contracts. As digital assets are highly coveted targets for hackers, maintaining high standards of security is crucial for the operation of blockchain networks and the safety of users' assets.
Using a hardware wallet to store cryptocurrencies is a security measure taken to protect the assets from being stolen in a hacking attempt.