Landing visa means that you do not need to apply for the visa of the destination country before departure, but apply for it after arriving in that country, which can eliminate all kinds of visa formalities before entry. Of course, there are conditions, and there are not many countries that implement landing visas for China. Visa-free means that you can enter the destination country without applying for a visa. Transit visa refers to the visa that you pass through a third country when you take the means of transportation after obtaining the entry visa to a certain country. Some countries stipulate that passengers who pass through their borders by means of transport and stay for no more than 24 hours or a certain period of time are exempt from applying for transit visas (generally not allowed to leave the international airport). Some countries stipulate that no matter how long you stay or whether you leave the airport, you must apply for a transit visa.