In certain cultures, including the U.S., it is customary to tip for a job well-done. In a surprising number of professions, employees actually make the majority of their money from tips, making the custom that much more necessary. Tipping is a way to say "thank you" for working so hard, or "thank you" for going above and beyond what was expected. In most cases tipping is simply the polite, socially acceptable thing to do, and in others you're obligated because of how much effort a person has put into their work. Many of us can feel awkward, or even confused...