[ButlerianJihad]

https://en.wikipedia.org/wiki/Plaintext

  With the advent of computing, the term plaintext expanded beyond human-readable documents to mean any data, including binary files, in a form that can be viewed or used without requiring a key or other decryption device. Information—a message, document, file, etc.—if to be communicated or stored in an unencrypted form is referred to as plaintext.

https://csrc.nist.gov/glossary/term/plaintext

    Unencrypted information that may be input to an encryption operation. Note: Plain text is not a synonym for clear text. See clear text.

    Intelligible data that has meaning and can be understood without the application of decryption.