Words are normally black on white background.
Highlighting turns backgrounds into a different color.	Like this white sentence with a dark background.
Here is how to highlight: Place the tip of the arrow in front of the words to highlight. Hold the left mouse button down. Drag arrow across the words. When background behind words are a different color, they're highlighted.
Try highlighting this word. ---------------------------->	Hey,
Try highlighting this sentence. ---------------------------->	Hey, I did it!
Try highlighting this paragraph. ----------------------------> You will need to drag the arrow down as well as across.	Hey, I did it. I highlighted this whole paragraph. But why? What's the point of highlighting?
	For the answer click 31