Question: What is a re-entry visa for China and why would I need it?
Answer: Re-entry visas are required for China if you are planning to leave the country and then re-enter during your stay. For most people traveling to China on a tour or holiday, it wouldn't be required. However, if you are planning to go to Hong Kong, then you DO need a re-entry visa.
Hong Kong, despite being officially part of China, can be confusing from a visa standpoint. From a travel perspective, Hong Kong is still separate from mainland China. You'll go through customs and immigration and if you don't have a return visa for China, you'll be ending your trip there. (Don't panic, you can apply for another visa to China from Hong Kong, but you'll have to hang around Hong Kong for a few days.)
