Markdown

Also called: md, .md, markdown file, markdown files, mark down

A simple way to format plain text with symbols, such as # for a heading and * for a bullet. It is easy for people to read and for software and AI tools to process, so it is a common format for notes, documentation and AI instructions.

For example: A founder writes product notes in Markdown, and the same file reads cleanly in a text editor, on GitHub and when pasted into an AI chat.