What is the difference (if any) between the names the UK and Great Britain?

no..... jaden ronaldo, US is united states which is north america, america is south & north america therefore it has mexico and argentina in america. UK is England, Scotland, Northern Ireland and Wales, but great britian is all of that but it includes loads of islands like isle of man and island groups of orkney and shetland.jaden ronaldo ur a dumb ****