What's the difference between landing visa and visa-free?

Landing visa: That is, which country did the applicant go to before applying for a visa, and the procedure is not very complicated. Some Southeast Asian countries, such as Thailand, Singapore and Malaysia, can take landing visa as an example.

Visa-free: There are two kinds. One is to go to some unknown islands, which can be exempted from visas. Another is that after obtaining a visa from a European country, applicants can travel to neighboring countries, usually Schengen countries, without a visa.

Ordinary visa: This means which country the applicant can apply for a visa.

There is no difference between these three kinds. It's all differentiated by region. For example, in order to vigorously develop tourism, some islands are exempt from visas, and some have good relations with China, so they can go to landing visa.