A Visa is a document that allows you to travel to a specific country for a specific period of time. It is generally issued by a country’s Consulate. A Visa may be stamped or glued to the inside of a passport, or it may be issued electronically (such as in Australia). Some countries require that you have a Visa to enter, while some countries may have agreements with eachother to waive Visa requirements to travel back and forth. A Visa may allow only one visit, or it may allow multiple visits. Without a Visa, you will be prevented from boarding flights to many countries.