A "256-bit" refers to the size of data or encryption keys that are 256 bits long, which is equivalent to 32 bytes. This length is commonly used in cryptography, providing a high level of security. For example, the Advanced Encryption Standard (AES) often employs 256-bit keys to protect sensitive information, making it extremely difficult for unauthorized users to decrypt the data. In computing, a 256-bit architecture can process data in chunks of 256 bits at a time, enhancing performance for certain applications. This is particularly relevant in fields like blockchain technology and cryptography, where secure and efficient data handling is crucial for maintaining integrity and confidentiality.