What a thing holds inside it. From the same root as contentment - to be content is to have one's wants bounded by what is already held.

A held collection of records, kept in order. First a literal thread - documents strung on a wire so they could be found again.

The extension marking a markdown file. A named abbreviation rather than a concept.

A written work set down to be read and answered — a draft, a telling, a record put in a form that can travel. What is written stays readable after the writing.

The plain configuration format spoken as a word — obvious, minimal, human-readable settings.

The extension marking a plain text file. A named abbreviation rather than a concept.