What is the difference between the Golden Ball and the Golden Boot awarded in the FIFA World Cup?
The difference between the two is very clearly explained on Wikipedia:
The Golden Ball award is presented to the best player at each FIFA World Cup finals
The Golden Boot [...] Award goes to the top goalscorer of the FIFA World Cup.
(Note that the Wikipedia page is slightly out of date with respect to who votes for the Golden Ball - while in 2010 it was voted for by the media, in 2014 it was voted for by the Technical Study Group).