The basic concept in ExpressionEngine is that of a template. Go to any ExpressionEngine powered website and you will undoubtedly be looking at a template. Templates are what the outside world sees. At its most basic, a template in ExpressionEngine is a HTML (or CSS or JavaScript) file. If we wanted to, we could use a template exactly like a HTML file, without any problems. We could create an entire website without ever using any other part of ExpressionEngine. At the end, you will have a completely working weblog, and a great understanding of how you can use HTML and CSS in templates.