By definition, marketing is the action or business
of promoting and selling products or services.
But let's go further. How do we promote or sell?

COMMUNICATION

Communication is the underlying fabric of all humanity. Think about it. It is literally part of all interpersonal behaviors, and there's no exception when it comes to brands and companies trying to promote or sell a product or service. So when I say it's everywhere and it's nowhere, I mean it's a seamless part of our everyday lives whether we realize it or not. Marketing is communication. It can be an unassuming conversation between two people at a party. It can also be a very direct, 1-way message like a big shiny billboard. There are many approaches, which means the real question is what form of communication is most effective?
 

Well, that depends on who you're talking to.