A dependent visa is a type of visa that allows the dependent family members of a primary visa holder to accompany them to another country. The primary visa holder is usually someone who has been granted a work visa, study visa, or other type of visa that allows them to reside in a foreign country. 

Dependent visas are usually granted to spouses and minor children of the primary visa holder. The visa allows them to live in the same country as the primary visa holder for the duration of their visa. 

The requirements for obtaining a dependent visa vary depending on the country and the type of visa the primary visa holder has. In some cases, the dependent may be required to demonstrate that they have sufficient funds to support themselves while living in the foreign country. They may also be required to undergo a medical examination or obtain certain vaccinations.