A physicist is a scientist who studies the nature of all the universe from everthing in the universe to the
infinitely tiny sub-sub-atomic strings.
a physicist usually must have a Ph.D to be able to do research at a university or for the government.
Most of the time before a physicist can get a high paying job he must perform his postdoctoral research.
Physics is the most simple and most complex science in the universe it encompasses the universe and eveything in it. They unravel the mysteries of everything from the big bang to why the sky is blue.