"Marketing" - The other way to understand it.

A Professor explained about Marketing to MBA students...

One, you see gorgeous girl in a party, you go to her and say "I am rich, marry me." - that is Direct Marketing. 

Two, you attend a party and your friend goes to a girl, pointing at you and tells her "He is very rich, marry him." - that is Advertising. 

Three, a girl walks to you and says "You are rich, can you marry me?" - that is Brand Recognition. 

Four, you say "I'm very rich, marry me." and she slaps you - that is Customer Feedback. 

Five, you say "I'm very rich, marry me." and she introduces you to her husband. - that is Demand & Supply Gap. 

Six, before you say "I'm rich, marry me." your wife arrives - that is Restriction from Entering New Market.