Does being aware of your target audience makes your work more effective?

IF we come to sales area will find that, sales is like fishing, First you have to identify the species you would like to target, then comes lots of research as you must learn everything about that species before you even attempt to baiting the hook. Sales is no different, lots of research about your target audience formulate a strategy which may entice them to buy what you are selling. 

Well Prepared Strategies lead to success.