AES 256-bit encryption refers to the process of concealing plaintext data using the AES algorithm and an AES key length of 256 bits.
AES (short for Advanced Encryption Standard) is a symmetric block cipher used to protect sensitive information. As a block-based encryption, AES stores data in blocks as large as 256 bits per block. AES 256-bit encryption supports the largest bit size and is virtually impenetrable by brute force. It is considered the strongest encryption standard.