More specifically, you can send the gift but the people will not be able to redeem them. They end up stuck with a useless email. What you can do is send iTunes gift cards. These can be sent electronically and can be purchased for one country's specific store, in your case USA, from another country.
A passport is a travel document, usually issued by a country 's government, that certifies the identity and nationality of its holder for the purpose of international travel.Standard passports contain the holder's name, place and date of birth, photograph, signature, and other identifying information. passport is a document certifying identity and nationality; having the document does not of itself grant any rights, such as protection by the consulate of the issuing country, although it may indicate that the holder has such rights.
The visa usually is in the form of a stamp or sticker placed IN the passport and is obtained from the country you are visiting. What is a travel visa? A travel visa is a stamp or sticker placed by officials of a foreign country on a passport that allows the bearer to visit that country. Visas are obtained from the proper embassy or local consulates of the country to be visited. Visit is further defined as the reason for entry, usually business, tourist or transitory. There are over 270 countries that offer travel visas and literally thousands of different types of visas available based upon country, type of visit, and length of visit.