While "largest" can be measured in several ways, the travel and tourism industry remains one of the world's most dominant economic forces in 2026. According to the WTTC, the sector contributed approximately $9 trillion to global GDP in 2025 and is projected to surpass $12 trillion by 2036. It accounts for roughly 1 in every 10 jobs globally, making it a primary engine for employment and international trade. While industries like "Global Healthcare" or "Financial Services" often report higher raw revenue, tourism is uniquely "large" because of its massive multiplier effect—spending in tourism fuels growth in agriculture, construction, and local retail. In 2026, the industry has officially "normalized" after years of volatility, with the Asia-Pacific region leading the charge as the largest regional market by volume and growth.