Domain pointing takes domain parking another step further by allowing multiple domains which resolve to different index pages or directories on the same hosting account. Domain pointing would come into play if one wanted to maintain TWO distinctly different web sites while paying and maintaining only one hosting account (aka a "twofer" deal).
Example:
www.abc.com-> http://abc.com/index.html
www.cpu.com -> http://abc.com/xyz/index.html