More about tipping
Tipping is common in the US and Canada while in other countries may be considered as poor service or even as an insult. In Japan for example, tipping is not common. Tips varies by each country and the total of the bill.
Tipping as mentioned above, is very common in the US and Canada and it is seen as a gesture of gratitude towards an employee of a place which served you for purchasing a service, ordering dinner, dying your hair, transported you somewhere, helped you with the luggage and more.
How much to tip?
There is a unwriten rule where people usually tip between 10%-20%. This one depends if you liked the service or not. Not tipping at all is usually seen as you didn't like the service.
Why tipping is important for employees?
Usually employees that work with businesses like restaurants and coffee shops have minimum wages and depend on the tips they get from customers and guests. The tips are then usually split between all employees. Each position sometimes has a different percentage of the tips they get when the money is split at the end of the day. The tip amount is usually 4 or more times greater than their wages.