A unique password prevents a breach at one website from becoming access to every other account. It is one of the simplest ways to stop credential stuffing and limit the damage of stolen login data.
Why reuse is dangerous
Attackers routinely test stolen email-and-password combinations against Microsoft 365, banking, payroll, and other popular services. A reused password turns an unrelated breach into a business incident.
Use a password manager
A reputable password manager creates and stores long, random passwords so people do not need to memorize them. Shared business credentials can be controlled and revoked without sending passwords through email or chat.
Add another layer
Multifactor authentication helps when a password is exposed, but it does not make weak password habits harmless. Use unique passwords, MFA, and individual accounts together.
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The only password worth memorizing is a strong master passphrase; the rest should be unique and securely managed.