Password vs passphrase
A classic password bets on odd characters in little space ("Xj9$mK2!"); a passphrase bets on several random words ("horse-battery-staple-correct"). What matters against an attack is entropy — the bits of randomness — and there a long passphrase usually beats a short password, while also being easier to remember.
| Aspect | Contraseña | Frase |
|---|---|---|
| Typical entropy | ~52 bits (8 chars) | ~77 bits (6 words) |
| Memorable | No | Yes |
| Easy to type | No | Yes |
| Ideal with a manager | Yes | Optional |
| Brute-force resistance | Depends on length | High with 5+ words |
When to use Contraseña
Use a random password when a manager stores it for you and there is a length limit: maximum entropy per character in the least space.
When to use Frase
Use a passphrase when you must type or remember it (team login, encrypted disk, manager master key): 5-6 random words give huge entropy and type without errors.
In short: For machines, a long random password. To memorize, a passphrase. In both cases the key is that the randomness is cryptographic (Web Crypto), not words that merely "look random".