A visa is a document that allows you to enter a country other than yours .
That is, after making your request to the destination country to which you want to travel, it will be in charge of approving it and accepting your request (while you are in your country of origin). This will help the border authorities verify that you can enter.
As a summary, it is equivalent to a permit that authorizes you to reside for a certain time in a foreign country ; allowing entry, stay or temporary residence.
Therefore, and unlike a passport, a visa is necessary for the country of destination to identify you . It is the decision of the territory of destination to grant it or not, since with them they regulate the entry of foreigners.
Its duration ranges from 3 months to 1 year , depending on the type.
For example, a tourist visa has a maximum duration of 90 days , while a residence visa can reach 365.
Another important difference is its format. In this case, the most normal thing is that the visa is a stamp that is placed inside the passport .
However, we also find cases in which it consists of a card with a photograph and a visa number.
Operation and relationship with third countries
Visas work through agreements with third countries in a reciprocal way.
That is, each country has bilateral agreements with other countries to prevent both populations from requiring a visa to move between their borders.