Security+ ยท 3.0 Security Architecture
Salt
A random value added to a password before hashing, so identical passwords hash to different values. Defeats rainbow-table attacks. Stored alongside the hash.
How this shows up at NCAE
Modern Linux /etc/shadow uses salted hashes ($6$ = SHA-512 + salt). Postgres scram-sha-256 uses per-user salts. You don't configure salts. the password-hashing function does it automatically if it's modern.