What is a primary function of a travel visa?

A travel visa serves the primary function of legally allowing entry into a visiting country. It is an official document issued by the government of a country that grants permission for a foreign national to enter, stay in, or transit through that country for a specified period and purpose, such as tourism, business, or study. This legal status is crucial because entering a country without the required visa can lead to legal consequences, including fines or being denied entry.

In contrast, the other options do not accurately reflect the primary purpose of a visa. While customs clearance is an important process when entering a country, it is separate from the visa's function. Similarly, providing insurance coverage is not a role of a visa; travelers often need separate travel insurance policies for protection during their trips. Lastly, discounts on travel packages may be available through various means, but they are not related to the legal requirements for entry that a visa addresses.