Q.Is having the same password for all your accounts on different websites safe?

No — it is unsafe. The password is only as safe as the weakest website that stores it.

• Websites do get breached, and stolen credential lists circulate widely.
• Attackers then perform credential stuffing: they automatically try the leaked email-password pair on banking, email and social sites.
• With one shared password, a single breach anywhere compromises every account — including your primary email, which can then be used to reset all other passwords.

Safe practice:

1. A unique, strong password per account (longer = better, mixed character types).
2. A password manager to remember them for you.
3. Two-factor authentication (2FA) on important accounts. …

Why it feels safe but is not. One memorable password for everything is convenient, and none of your accounts may ever have been "hacked" directly. But your password does not live only in your head — every website you register on stores a copy (hopefully hashed, sometimes badly). Your security therefore equals the security of the weakest site you ever signed up on.

The actual attack — credential stuffing:

1. Some site — often a small forum or shopping site with weak security — suffers a data breach; its user database (emails + passwords) leaks.
2. These leaked combinations are compiled into huge lists traded/hosted online.
3. Attackers run automated tools that try each leaked email-password pair on hundreds of other services: email providers, banking, social media, gaming.
4. If you reused the password, they walk straight in — no "hacking" of those sites needed.
5. Worst case: they enter your primary email. From there they press "Forgot password" everywhere else, intercept the reset links, and take over even accounts where you had used different passwords.

The safe discipline:

• Unique password per account — a breach then damages only that one account.
• Make each one strong: 12+ characters mixing upper/lowercase, digits and symbols; no dictionary words or personal details. …