You see a gorgeous girl at a party; you go up to her and say
"I'm fantastic in bed".
That's Direct Marketing.
One of your friends goes up to her, points at you and says
"He's fantastic in bed"
You go up to her and get her number. The next day you call and say"
Hi, I'm fantastic in bed"
You straighten your tie, 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.
She walks up to you and says "I hear you're fantastic in bed"
That's Brand Recognition.