Front matter is the metadata included at the beginning of a markdown file. It is used to store information about the page, such as the page title, author, date, etc. The front matter must be enclosed in between two sets of three dashes (---). Here is an example:
title: This is the title of the page
author: John Doe
date: January 1, 2020
The front matter can contain any number of key-value pairs, and you can use any valid HTML in the values.