What's the difference between Schengen visa and ordinary visa?

Visa is the annotation and seal of the sovereign organ of a country on the passport or other travel documents held by its own or foreign citizens to show that they are allowed to enter or leave the country or pass through it. It can also be said that it is an endorsement certificate issued to them. Generally speaking, a visa is a document issued by a country's entry-exit administration department (such as immigration bureau or its embassy or consulate abroad) to express approval to foreign citizens.

Schengen visa refers to the visa issued according to the Schengen agreement. The agreement was named after it was signed in Schengen, Luxembourg, and stipulated the single visa policy for member countries.

According to this agreement, the visa issued by any Schengen member country is also considered valid in all other member countries, and there is no need to apply for another visa, and the country that implements this agreement is commonly known as the "Schengen country".

The difference between a Schengen visa and an ordinary visa is that as long as you apply for any Schengen visa, you can stay in any Schengen country and anywhere within the validity period of the visa, while an ordinary visa can only stay in the country where you apply for a visa.