sometimes we jump into quick conclusions in terms of what marketing means like Dictionary.com defines marketing as, "the action or business of promoting and selling products or services, including market research and advertising." The selling part, for instance, overlaps a little more than needed with a "what is sales" definition, and the word advertising makes me think of Mad Men brainstorming sessions.
Come to think of it, Marketing is present in all stages of the business, beginning to end. seriously, think about it, Marketing is the bed-rock for product development, or a sales pitch, or retail distribution. this is why your marketer have his/her finger firm on the pulse of your consumer persona. They research and analyze your consumers all the time, conducting focus groups, sending out surveys, studying online shopping habits, and asking one underlying question: "Where, when, and how does our consumer want to communicate with your business?" (if your marketer dont do this, fire him/her, if you dont have a marketer? call us)