What is markdown? Colaboratory has two types of cells: text and code. The text cells are formatted using a simple markup language called markdown. Quick reference To see the markdown source, double-click a text cell, showing both the markdown source (above) and the rendered version (below). Above the markdown source there is a toolbar to assist editing. Headers Headers are created using #. Use multiple ### for less emphasis. For example: This is equivalent to an h1 tag This is equivalent to an h2 tag This is equivalent to an h3 tag Bold To make text bold surround it with **two asterisks**. Italic To make text italic use a *single asterisk* or _underscore_. Bold inside italics and vice-versa also work. Strikethrough Strikethrough uses ~~two tildes~~ while monospace (such as code) uses `backtick`. Code To make a code block surround the code with ```. For example: def factorial(n): fact = 1 for num in range(2, n + 1): fact *= num return fact Links Links are created with [brackets around the linked text](and-parentheses-around-the-url.html). Naked URLs, like https://google.com, will automatically be linkified. Another way to create links is using references, which look like [brackets around the linked text][an-arbitrary-reference-id] and then, later anywhere in the cell on its own line, [an-arbitrary-reference-id]: followed-by-a-URL.html Image A '!' character in front of a link turns it into an inline image link: Google's logo Indentation Blocks are indented with >, and multiple levels of indentation are indicated by repetition: >>> indents three levels. One level of indentation Two levels of indentation Lists Ordered lists are created by typing any number followed by a period at the beginning of a line. An ordered list: One Two Three Unordered lists are * or - at the beginning of a line. An unordered list: One Two Three Lists can be nested by indenting using two spaces for each level of nesting. One Two Three One Two Horizontal Line Horizontal rules are created with three or more hyphens, underscores, or asterisks (---, ___, or ***) on their own line.