Tipping customs vary dramatically worldwide, with the United States and Canada expecting 15-20% in restaurants while many European countries include service charges in bills making additional tips optional. European destinations typically appreciate 5-10% tips for exceptional service, with rounding up taxi fares and leaving small amounts (EUR 1-2 per day) for hotel housekeeping staff considered polite. Middle Eastern countries generally expect 10-15% restaurant tips if service isn't already included, plus small amounts for bellboys (USD 1-2 per bag) and housekeeping staff. Asian countries like China and Japan traditionally don't expect tips, though hotels serving international tourists and tour guides may accept them, while tipping can actually be considered offensive in Japan. Some countries automatically add service charges (10-15%) to restaurant bills, so travelers should carefully check receipts to avoid double-tipping. Cash tips are universally preferred over credit card tips, and having small denomination local currency makes tipping hotel staff, drivers, tour guides, and service workers more convenient.