Markdown is a minimalist markup language that allows developers and web designers to manage edit their code as intuitively as possible.
Somewhat similar to text editors, markdown editors provide users with simple syntax, so as to allow them to focus on contents rather than on the form of their projects.
When previewing text in these applications, users can easily spot mistakes or typos and correct them, especially since some of them feature built-in spellcheckers.
It is easier for web designers to use markdown language in their work instead of HTML, considering the learning curve is not a steep one.