plain text

Short definition from Wiktionary

Noun

1. 1
   Text or any data that is to be encrypted (as opposed to ciphertext).
2. 2
   Human readable text which consists only of a string of characters, represented using a character encoding such as ASCII or Unicode. In the file format sense, plain text may represent structured data in a human readable format such as XML.
3. 3
   Data which consists only of human-readable unformatted text, as opposed to machine-readable binary data or formatted/structured text. In this sense, the character data in between XML tags may be called "plain text".

Adjective

1. 1
   Alternative spelling of plaintext.