Tip can be defined as a personal reward offered to somebody who gives the extra mile to meet or exceed the customer's expectations. Tipping is way to say thank you to someone for a job well done. The amount you want to thank that person is up to you. And also tipping is a different concept in all countries, there are places where tipping is considered impolite or rude, and other places where if you don't tip your behavior unacceptable. The first thing to be aware of it is what you are for and what is expected for you.
The first key to understanding is realizing the situation at hand. Starting with restaurants, the general rule is between 10-20% of the bill before taxes. Some people choose to tip extra of they feel the service is outstanding. While many will leave a small tip or not at tip at all if they feel the service is terrible. However, not leaving a tip because the service did not meet expectations can often lead to a confrontation. It is often better to leave some kind of a tip, but be sure address the situation with the manager. It is also vital to know the local customs when it comes to tipping.
Many people in the service industry depend on tips to supplement their wages, which are often set artificially low in expectation of the tips they will receive. The key thing to remember is that tipping is a personal decision, but it affects others. So the idea of treating other as you would to be treated clearly resonates. Be wary of restaurants that add a tip to the bill automatically, no one should pay two tips for the same meal.
Traveling in Asia is often a culture shock, and this is magnified when it comes to tipping. While most of the globe follows the thinking that gratuities are required, or at the very least expected, many countries in Asia strictly forbid it, and many service workers will be offended if you attempt to tip them. Tipping is not the custom in India, China, Korea, Taiwan, and especially Japan. Likewise, in Australia and New Zealand, tipping has not historically been a custom and it is not expected, although the practice is growing, and has become especially common in the tourist areas. Tipping is a form of art that once mastered can make your travels more fun and less stressful.