What is the main purpose of tours?

in respect of your question i like to bring a example of change , some need good food  to live but living in big cities or vallies people need change for life happy they need of tours natural sights or world famous personalities meetings shows or games watching in stadiums to bring life happy. these tours fresh and wanted some success to further more struggle ness to be happy life. one of tours are study purpose or can be helping events or family celebrating events. tour is kind of physical change in some favorite experience. some can travel for business tour , famous celebrities are often living in good happy life by their tours and purpose of popularity. fans and popularity make the human social world.