The overall appearance of your website is made up of themes, header image, background color or image, and widgets. Within the “Appearance” menu is where you have access to this information. 
It is also within the Appearance that you usually have access to your theme settings as well as some of the plugins.
Modules
Themes
Lessons
Widgets
<p>A widget is a small application that usually displays content in the sidebar or footer of your website page. This can be text, links, input boxes, videos, audios, etc. There are many widgets on the market both free and for a cost that cover many different types of applications.</p>