A password is the broad term for a secret used to authenticate you. A passcode usually means a numeric code, often one that unlocks a device or approves an action. The terms overlap: a PIN can be a password in technical guidance, while a device passcode may work locally rather than being sent to an online account.
How password, passcode, PIN, and passphrase differ
Products do not use these labels consistently, so the purpose of a secret matters more than its name. In its digital identity guidance, the National Institute of Standards and Technology (NIST) treats a password as a secret authenticator—a “something you know” factor—and defines a PIN as a password that typically consists only of decimal digits. A passphrase is a password made from a sequence of words or other text. NIST SP 800-63B-4 and the NIST glossary describe these terms.
| Term | Usual meaning | What to keep in mind |
|---|---|---|
| Password | A secret used as an authentication factor; it may contain letters, digits, symbols, or words. | It is the broader category. |
| Passphrase | A password made from a sequence of words or other text. | It can make a longer secret easier to remember. |
| PIN | A password that typically consists only of decimal digits. | It may authenticate an account or serve a local device function. |
| Device passcode or unlock PIN | A code entered on a device to unlock it or approve access. | If it locally unlocks an authenticator, NIST calls it an activation secret; it may not be sent to the service you are accessing. |
| One-time passcode (OTP) | A generated secret intended for one use. | Unlike a stable password or unlock code, it is meant to be used once. |
The word “passcode” alone does not tell you whether a code is a device unlock secret, an account credential, or a one-time code. Check what the prompt is asking you to access and where the code comes from.
Why a phone passcode is different from an account password
When you type an account password into a website, that secret is used in the account’s authentication flow with the service. A phone’s unlock PIN can have a different job: it may unlock access to a key or other authenticator stored on the device. NIST calls a local password or PIN used this way an activation secret. It stays within the authenticator and its associated endpoint instead of being sent to the remote service as the account password would be.
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This distinction helps explain why a phone may ask for its passcode when you use a passkey. The passcode can unlock the device that holds or uses the passkey; it is not necessarily the password for the account you are signing into. The exact behavior depends on the device and service.
How to make passwords and account access safer
- Use a unique password for each account. Reusing one secret means a breach at one service can put other accounts at risk.
- Use a password manager for accounts that still require passwords. NIST recommends a password manager that supports multi-factor authentication (MFA). Its consumer guidance recommends at least 15 characters for a password and explains that a passphrase can help with memorability. See NIST’s password guidance.
- Turn on MFA where available. It adds another authentication step, rather than relying on the password alone.
- Use passkeys when a service supports them. NIST says passkeys avoid memorization and are less susceptible to phishing theft. A device PIN may still be required to unlock the device used with a passkey.
For centrally verified passwords, NIST SP 800-63B-4 (2025) sets a minimum of 15 characters when the password is used as a single factor. When it is used only as part of an MFA process, the standard permits a minimum of eight characters. The standard also disallows extra character-composition rules and routine password changes unless there is evidence of compromise. A service or device may set its own requirements.
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Length helps with password strength, but it does not stop phishing, keylogging, or social engineering. NIST states in SP 800-63B-4 that “Passwords are not phishing-resistant.” That statement concerns passwords as an authenticator type under the guideline; it does not mean that every numeric passcode is less secure than every password. Security also depends on unpredictability, verification methods, rate limits, device protections, and what the secret unlocks.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which term should you use?
In everyday use, “password” usually refers to an account secret, while “passcode” often refers to a numeric code for a phone, app, or action. That is a common convention, not a universal technical distinction. If a prompt is unclear, look at the account or device it names and whether it asks for a stored unlock code, an account credential, or a temporary code sent or generated for one-time use.
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