What's the Difference Between an Alpine Touring Ski and a Telemark Ski?

Aren't you just sick and tired of hearing this question from your friends and family members and not having a decent answer?  Well today is your lucky day.

Now be forewarned.  This is one of those situations where more knowledge equals more complication.  Before I reveal this mystery, let me be clear that manufacturers don't always clearly label when a ski has been manufactured for telemark or alpine touring performance. Furthermore you begin to notice the downright contradictions in most ski reviews.  You may end up doing a lot of digging to determine whether a ski is "ideal" for a particular type of endeavor. You may be better off just not knowing.  Read on at your peril.