This programming language may be used to instruct a computer to perform a task.
See Also:

Listed below are all of the tasks on Rosetta Code which have been solved using PlainTeX.

Donald Knuth's techne (from the greek τέχνη, which he abbreviated to TeX) is a set of primitive tokens which are complex to use on their own. Knuth wrote composite operations of these primitive tokens himself, called macros, to make document creation easier.

The base techne and a set of macros together are called a format of techne. Plain TeX is the simplest format.

Often when referencing TeX, it is implied that Plain TeX is used.

Extensions to the Plain TeX format exist, such as eplain(TeX) or LaTeX.