Defining the travel and tourism industry is a challenge, since it includes other industries offering various services. In a broad sense, the industry is about transportation and logistics. It’s also about catering to travelers’ needs for lodging, attractions, and dining after they arrive at the destination. Since 2006, the travel industry has been one of the greatest contributors to global GDP, contributing around 2.9 trillion US dollars in 2019, which is 79% more than 13 years before.

https://steelkiwi.com/blog/how-travel-app-development-change-the-industry/