Why do we say that fat is burned by OXPHOS? and what is OXPHOS?

Question

What's the difference between a fat and a sugar? Can we burn them both by oxphos? Oxphos is oxidative phosphorylation right?, this means adding oxygen to stuff and reducing it, making it less reactive, is this correct? Or can we add H as well?

Answer 1

The long version http://www.rpi.edu/dept/bcbp/molbiochem/MBWeb/mb1/part2/oxphos.htm

the short version I hope either or both of these sites help
http://www.mitosciences.com/ms602.html

encyclopida description
http://en.wikipedia.org/wiki/Oxphos