What's the meaning of custom font in Exercise 6?


I've followed the instruction and pass the exercise, but I still don't know the meaning of custom font.

link href="http://s3.amazonaws.com/codecademy-content/courses/ltp/css/shift.css" rel="stylesheet">

I've followed the link and watch the css, but can't get idea about the real usage of custom font. Can someone explain the meaning of this part?


Your computer and my computer might have different fonts installed on it. If you want the web pages that you design to appear with a particular font you can not rely on my machine having that font.

To solve this problem, you can link to a font file, like we did with shift.css. That pulls all of the font info and includes it for everyone viewing the page.