The United Kingdom comprises England, Scotland, Wales, and Northern Ireland. Its official name is ‘The United Kingdom of Great Britain and Northern Ireland‘. ‘Great Britain‘ refers only to England, Scotland, and Wales, not Northern Ireland. The rest of Ireland is an independent country.
People may refer to their nationality as British, English, Scottish, Welsh or Irish, but they all have British citizenship.
Several islands are called ‘Crown Dependencies‘:

• .  Jersey and Guernsey (Channel Islands)
• .  The Isle of Man

They are considered British in the sense that they are under the sovereignty of the British Crown. However, they are not part of the United Kingdom. Each Crown Dependency operates with a significant self-governance and has a legal and political system.

Several British overseas territories exist in other parts of the world, such as:

• Anguilla
• Bermuda
• British Indian Antarctic Territory
• British Indian Ocean Territory
• British Virgin Islands
• Cayman Islands
• Falkland Islands
• Gibraltar
• Montserrat
• Pitcairn Islands
• Saint Helena, Ascension, and Tristan da Cunha
• South Georgia and the South Sandwich Islands
• Sovereign Base Areas of Akrotiri and Dhekelia (on Cyprus)
• Turks and Caicos Islands

They are directly governed by the United Kingdom, which is responsible for their defense and foreign affairs. Each territory has its own local government and administrative structure, allowing for self-governance in many local matters. However, the United Kindom retains ultimate responsibility and sovereignty over these territories.

• The UK is governed by a parliament based in Westminster. Scotland, Wales, and North Ireland also have parliaments or assemblies with developed powers in defined areas. 
• This website uses the words ‘Britain’, ‘British Isles’, or ‘British’ to refer to everyone in the UK.