This infographic is brilliant!
I've never seen it explained...so...so...WELL!
"Kirstin is a marketing professional / graphic designer (and former public relations rep) from Coquitlam, originally from Johannesburg, South Africa. During the day, she works for a renovation company, handling all aspects of their online and offline presence. When she's not at work, Kirstin loves anything and everything creative -- she bakes, sews, knits, quilts, maintains her blog (www.theoliveseed.com), and designs graphics."