A text in any language consists of words that have meaning, such as total, temperature, and values, which carry a data value, for example, 500 and 37.5°C. A program or script written in the Red language, likewise, consists of a series of words, which represent code, and values, which represent data. When executing a program, Red has to evaluate every word to obtain a value. Every value in Red source code has a type.

A word can, for example, be a name for a variable or a function, either created by the developer or built into the language. All the different words in a program, whether predefined or user-created, form its dictionary. By using well-chosen words for variables, blocks, objects, and functions, you can mold your Red code into almost any specific language for your application.

Type the command what in the console to get an overview...