Device hygiene means keeping laptops, phones, and tablets in a secure, well-maintained state: updated software, strong screen locks, full-disk encryption where available, and physical protection against loss or tampering. It is a basic security habit, but it matters because endpoint devices are where people read email, store credentials, approve logins, and access sensitive systems.
Poor device hygiene creates easy openings for attackers. An unpatched phone can be exploited through a vulnerable app or operating system flaw; an unlocked laptop can expose files, sessions, and password managers; a stolen device can become a foothold if it lacks encryption or remote wipe. Defenders rely on device hygiene through mobile device management, auto-updates, enforced lock screens, asset tracking, and user training. In practice, good hygiene reduces the damage from phishing, theft, shoulder surfing, and malware by making each device harder to abuse.