What is the difference between breathing and respiration?
Breathing is the mechanical action of getting air in and out of the lungs.
It is carried out by expanding and contracting the ribcage using the muscles located in between the ribs (these comprise the meat eaten when people have pork or cow ribs).
Once air, containing the valuable oxygen (about 20%) is inside the lungs, other processes can take place. The oxygen is transported, via bloodstream, to the cells all over the body where respiration takes place.
Respiration is the chemical reaction that provides the energy that makes the organism function. It occurs in the cells, more precisely in the mitochondria.
Organisms need energy to move, to keep warm, to perform digestion and other chemical processes, etccc.
Respiration is a chemical reaction that tranfers chemical energy contained in the glucose molecule to the ATP molecule, which is the energy "currency" of living things.
ATP will be consumed at the muscles, when you exercise, at the brain when you think, etc...
Finally, remember that plants do respiration, although they oviously don't breath.
Insects don't breath either. How insects get their oxygen into the body?