19 business etiquette rules every professional should know

And, unfortunately, many people wind up making fools of themselves because they don't understand that etiquette rules in business differ slightly from those in standard social settings.

In her book "The Essentials Of Business Etiquette," Barbara Pachter writes about the specific rules people need to understand in order to conduct and present themselves appropriately in professional social settings.

Here are the most important tips on how to introduce yourself, how to dress, and what to order at restaurants from Pachter's book.

Vivian Giang contributed to an earlier version of this article.