Md and files differences

What is the difference between .md files and files in the courses?

Hello @franlusan. I don’t see your course registration, which course are you referring to in this question? Thanks,

As you can see in the image it is MS-700 Course

Hello Kia

In this case I am referring to MS-700 but I think there are these two types of files in other courses too.

I do not know yet what the difference is between .md and files