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Twofish is classified as a block cipher. This means that it processes data in fixed-size blocks, typically 128 bits at a time, as it encrypts or decrypts information. Block ciphers such as Twofish use symmetric key algorithms, where the same key is used for both encryption and decryption. This is in contrast to stream ciphers, which encrypt data one bit or byte at a time and do not process fixed-size blocks. Additionally, asymmetric ciphers involve a pair of keys—public and private—whereas hash functions represent a one-way transformation to produce a fixed-size output from variable input, without the intention of reversing the process. Therefore, Twofish's classification as a block cipher highlights its design for secure symmetric encryption of large amounts of data in structured blocks.