Markdown is a lightweight, plain-text, markup language. It is used across the entire Stack Exchange network for post formatting (Questions, answers, wikis, chat).

Markdown is a lightweight markup language. The language takes many cues from existing conventions for marking up plain text in email; it is designed for maximum readability and "publishability" of both its input and output forms.

It is used across the entire Stack Exchange network for formatting. Markdown is used for: Questions, Answers, Wikis, Chat and Comments — although not all features are enabled in all contexts.

References:

Potential Gotchas:

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