Wordpress plugin to widget to sidebar

This video attempts to show the relationship between some Wordpress plugins, (such as “My Category Order”), and widgets, and then the relationship between widgets and the website sidebar. Some widgets come as defaults with Wordpress, and some come with the installation of a plugin. Once a plugin creates a widget, it appears under Appearances as an available widget, and must be dragged from the left side to the right side to make it appear in the sidebar of the side.