uk-visa tag should be used with questions concerning visas of various types for visiting the United Kingdom (the island of Great Britain, Northern Ireland, and several other islands in the region).

From Wikipedia topic United Kingdom or "The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) and colloquially Great Britain (GB) or simply Britain, is a sovereign country in western Europe. Lying off the north-western coast of the European mainland, the United Kingdom includes the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands."

The United Kingdom government has provide a web site, Check if you need a UK visa, which can help determine whether a visa is required as well as what type of visa.

For information about visas and immigration to the United Kingdom.