Marketing is how you go about promoting and selling a product. Any ad campaign is a type of marketing.
Marketing has to do with making people aware of what you have to offer, whether it's updated software, a clearance sale, or ice-cold lemonade. If a commercial really makes you want to buy something, the marketing worked. Politicians use marketing in their campaigns to convince voters. Marketing is all about selling — and given how many ads there are everywhere you look, it’s probably one of the most powerful forces in the world.