The lightweight styling markup language of GitHub, Reddit, StackExchange, Notion, and so many others.
Markdown is a lightweight styling language. It allows you to style your text without taking your hands off the keyboard. It encodes the basic styles into the text, but does so in a way that keeps the text very readable, unlike other markup languages (looking at you, Hypertext Markup Language).
It’s de facto standard is CommonMark.
Examples from Memory
# Heading 1
## Heading 2
### Heading 3 (... up to 6 I think)
Regular line of text.
New paragraph, separated by a blank
line from the text above.
---
Horizontal rule
*italic* and **bold**
* list
* of
* bullets
1. List
2. Of
3. Numbers
> Quote
[link to a page](http://www.google.com)
For GitHub & Notion, at least:
- [ ] To do
- [x] Completed to do