What is the difference between Ctrip private tour and group tour?

Private group refers to the exclusive tour group specially designed for private small groups or families, which is tailored to the needs of customers and very personalized. Generally, there is also a private tour guide, and the fee is higher. Group tour refers to a guided tour group, which is universal, designs and provides group services according to the standard route of travel agencies, and its personalization is not obvious. That means I'm not an employee of Ctrip. I judge according to my working experience in Qingyi.