Markdown reference-style link

Reference-style links are a special kind of link that make URLs easier to display and read in Markdown.

Instead of inline link: [text](link), the reference-style:

[text][label]

[label]: https://google.com "Google"

First part of the link is formatted with two sets of brackets.

The second part of a reference-style link is formatted with the following attributes:

1. The label, in brackets, followed immediately by a colon and at least one space (e.g., [label]: ).
2. The URL for the link, which you can optionally enclose in angle brackets.
3. The optional title for the link, which you can enclose in double quotes, single quotes, or parentheses.

See it in action:

Basic Syntax | Markdown Guide