What is markdown?

In this guide, you will learn what markdown is, why it was invented, and why it turns up so often once you start working with AI.

The problem markdown solves

Imagine you are writing a note to a friend and you want one word to stand out. In a word processor you would reach for the mouse, highlight the word, and click the bold button. That works, but it means stopping to point and click every time you want to change how something looks.

Now imagine you could show that a word is bold using nothing but the keys in front of you, without ever leaving the flow of typing. That is the small, clever idea behind a plain-text formatting language called markdown.

You write ordinary text and sprinkle in a few simple symbols. A tool then reads those symbols and turns your text into headings, bold words, lists, and links. The symbols are chosen to look sensible even before they are turned into anything, which is the whole point.

What it looks like

Here is a short example. This is markdown as you would type it:

# My shopping list

I need to buy **milk** and *bread* today.

- Apples
- Coffee
- Cheese

Notice how readable that already is. The # marks a heading, the ** wraps a word you want in bold, the single * marks something for italics, and the dashes make a list. Even without anything converting it, you can tell what the writer meant.

When a tool displays that markdown, the # line becomes a large heading, “milk” appears in bold, “bread” in italics, and the dashes become a tidy bulleted list. You wrote plain text, and you got formatted text out the other end.

Why it exists at all

Markdown was created back in 2004 by writers who wanted formatting that stayed readable in its raw form. Older ways of marking up text, like the code behind web pages, worked fine for computers but were cluttered and hard for a person to read.

The goal was a format you could write comfortably, read comfortably, and hand to a computer comfortably, all at once. That balance is why it spread. Today you will find markdown in note-taking apps, messaging tools, documentation sites, and, as you will soon see, in nearly every AI chat tool.

Try it yourself

You do not need any special software to try markdown, because it is only plain text. Open any AI chat tool and paste in this request:

Rewrite the following as a short note using markdown. Give it a heading,
put the most important word in bold, and turn the three tasks into a
bulleted list.

Tasks for today: email the landlord, book a dentist appointment, and
pay the electricity bill. The electricity bill is the urgent one.

Look closely at what comes back. You will see the same #, **, and - symbols from earlier doing their jobs. You have now read markdown, asked for markdown, and recognised it in the wild, all in a couple of minutes.

A common first impression

A common first impression is that markdown is a programming language or something only technical people use. It is neither. It is closer to a handful of typing habits, like using a dash to start a list, that happen to be understood by a lot of software.

You do not have to memorise every symbol to benefit from it. Learning even two or three will change how comfortably you work with text, and the rest come quickly once you need them.

Next steps

Now that you know what markdown is and why it exists, the natural next step is to learn the small set of symbols that do the heavy lifting. We will go through headings, bold, italics, lists, links, and code, one at a time, in the next guide.