Wikipedia gives you a good definition and a very large list of areas. There's also the "Simple English" wikipedia. They give a very short and good definition for Physics. See...
The main branches of classical physics include: Classical Mechanics Electromagnetism Optics Thermodynamics As well as many other sub-branches like hydrodynamics, aerodynamics, etc. In modern physics,...
Molecular physics looks at the subatomic world. It looks at particles such as quarks, Leptons and a major study by CERN in Europe is searching for a particle known as the higgs boson. These...
Traditional physics is more commonly called "Classical Physics" and it was created by the old giants of physics like Newton and Galileo. Modern physics is the newer study of physics that was created...