Tipping is the practice of giving extra money to service workers as a way to show appreciation for their work. It is common in industries like restaurants, hotels, and taxis. The amount typically varies, but a common guideline is to tip around 15-20% of the total bill. In some countries, tipping is expected and considered part of the worker's income, while in others, it may be less common or even discouraged. The customs surrounding tipping can vary widely, so it's important to understand local practices when traveling or dining out.