What is a slide element?

What is a slide element?

A slide element is a shape, or a group of shapes, on a slide, that are inserted from the slide element library onto a slide in the active presentation. 

The difference between the slide library and the element library is that a slide library contains  whole slides for insertion, whilst the element library only contains graphics. 

A slide from the slide library:

An slide element from the slide element library:

What are the different types of slide elements available?

Simple icons or graphics

Single graphic elements

Graphic elements grouped together