Kuo skiriasi Anglija, Jungtinė Karalystė ir Didžioji Britanija. #UK
England--->A nation within the UK
UK---->A union of 4 nations - England, Wales, Scotland and Northern Ireland. It also includes many islands like Falkland Islands, British Indian Ocean Territory, etc.
Britain---> A region consisting of England and the Wales. Also known as Great Britain. The word great is used to distinguish "Little Britain" or Brittany in France.
Therefore, England is part of Great Britain, which is part of the United Kingdom.