AES is the standard symmetric cipher for TLS, disk encryption and PDF passwords — 128/256-bit keys.
Advanced Encryption Standard (AES) uses the same key to encrypt and decrypt — fast in hardware (AES-NI). Modes like GCM add authentication; ECB alone is insecure for structured data.
PDF password protection and ZIP AES use AES variants. Tentaco educates on crypto utilities — use audited libraries in production, not browser toys, for real secrets.