A country’s visa policy is a set of rules that determines who is allowed and who is not allowed to enter the country. The policy may allow passport holders from one nation to enter without a visa, but not those from another. The majority of visa rules are bilateral, meaning that two countries will enable their nationals to travel visa-free, however this is not always the case. When it comes to setting visa policies, there are no hard and fast laws. However, diplomatic links with the other country, the history of illegal immigration from the country, and cost and tourism factors are some determining factors.