As someone who has been involved in the marketing field, I find marketing-related humor particularly amusing. There’s a lot of junk on UrbanDictionary.com, but whoever posted something for “marketing” has the right idea.
If you look up “marketing” on UrbanDictionary.com this is what the first entry says:
You see a gorgeous girl at a party. You go up to her and say, "I'm fantastic in bed."
That's Direct Marketing
You're at a party with a bunch of friends and see a gorgeous girl. One of your friends goes up to her and pointing at you says, "He's fantastic in bed."
You see a gorgeous girl at a party. You go up to her and get her telephone number. The next day you call and say, "Hi, I'm fantastic in bed."
You're at a party and see a gorgeous girl. You get up and straighten your tie, you walk up to her and pour her a drink. You open the door for her, pick up her bag after she drops it, offer her a ride, and then say, "By the way, I'm fantastic in bed."
That's Public Relations
You're at a party and see a gorgeous girl. She walks up to you and says, I hear you're fantastic in bed."
That's Brand Recognition
This humorous comparison between marketing and trying to pick up a girl does also point out the differences between the different “fields” that all have an influence on how a product (or person) is viewed. Everyone is trying (some trying harder than others) to get you to see them in a favorable light.
I find it interesting that professionals consider themselves to be in one and only one of those fields (direct marketing, advertising, public relations, etc), but really all of those things are just “marketing.” They all have the same end goal: to get the girl. The whole idea is to get her in bed, it doesn’t much matter how you go about it.