[Markdown](https://en.wikipedia.org/wiki/Markdown) is a lightweight markup language used across the entire Stack Exchange network for post formatting.

Consider using the [meta-tag:mathjax], [meta-tag:images] or [meta-tag:spoilers] tags instead if your query is about these aspects of Markdown.

The basics of Markdown are explained in the [editing help](https://mathoverflow.net/editing-help).