Contour Drawing Definition

I became curious about the definition of contour drawing so I did a search and apparently there is contour drawing and then blind contour drawing. Here's a paragraph from Ask.com:

"Blind Contour drawing is a favourite with drawing teachers to develop hand-eye communication. Contour drawing is essentially outline drawing, and blind contour drawing means drawing the outline of the subject without looking at the paper. The end result doesn't matter - what is important is carefully observing the subject."

Here's the full article.