Thanksgiving Day is a day for giving thanks to family and friends in the United States. Some people think Thanksgiving is the most important holiday of the year because they believe the two most important words in the English are "thank you". For business success, a "thank you" tells a prospect or partner that you are appreciative of what he has just done. And that means you have an interest in that person and the business relationship as well. For social interaction, expressing gratitude in equally important to show how you value the other person and the social relationship you have with him. Therefore, "thank you" is a bonding phrase. Additionally, giving thanks in most important for our pursuit of happiness. Whatever you have, you can either appreciate or not. If you appreciate it and really notice that you have it, it will bring you happiness. However, if you take it for granted, and focus on things you don't have, what you do have won't bring you happiness.