When someone in the finance industry says "you'll be very good in sales", what exactly does that mean?

I guess what I'm asking is, what exactly is "sales". Every time I run into and talk to someone in the finance industry, they always say "you'll be very good in sales" and I just want to more about exactly what that means - maybe ill get into the finance industry! I just want to fully understand what it means (as in I would be a good trader? hedge fund manager? sell side? buy side?), thats all. Thanks to all in advance.