UK, Britain, Great Britain (GB) and the British isles

What is the difference between UK, Britain, Great Britain (GB) and the British Isles?
" Cuando la gente dice Inglaterra, que a veces significan Gran Bretaña, a veces, el Reino Unido, a veces, las Islas Británicas -  pero nunca Inglaterra. ' Cómo ser un Alien 'por George Mikes Why is England or the UK sometimes called Britain? "Inglaterra" a veces, erróneamente, que se utiliza en referencia a todo el Reino Unido, la totalidad de la isla de Gran Bretaña (o simplemente Bretaña), o incluso las islas británicas. Esto no sólo es incorrecta sino que puede ofender a personas de otras partes del Reino Unido. ( England, Scotland, Wales, Great Britain refer to different 'parts of the UK. The British Isles includes many islands not even part of the UK. England Scotland Wales Britain Great Britain UK British Isles La historia diversa de Inglaterra, Escocia y Gales ha dado lugar a muy diferentes tradiciones culturales; Los escoceses y los galeses tienen derecho a sentirse ofendido cuando se utiliza el término 'Inglés' erróneamente, en el sentido de los tres. Countries within a Country - The United Kingdom The name United Kingdom refers to the union of what were once four separate countries: England, Scotland,Wales and Ireland (though most of Ireland is now independent, only Northern Ireland remains part of the UK). The United Kingdom The UK's full and official name is the "United Kingdom of Great Britain and Northern Ireland". History of the making of the UK 1536 - Act of Union joins England and Wales 1707 - Act of Union unites Scotland and England, together with Wales to form the Kingdom of Great Britain.  1801 - The Irish Parliament voted to join the Union. The then Kingdom of Great Britain becomes theUnited Kingdom of Great Britain and Ireland.  1922 - Name changed to United Kingdom of Great Britain and Northern Ireland, when most of the Southern counties in Ireland choose independence. Britain Britain comprises only England and Wales. Find out why here Great Britain Great Britain comprises only England, Scotland and Wales. Find out more about Great Britain British Isles The British Isles - made up of several islands. Great Britain is the largest one. http://projectbritain.com/britain.html