Physics is a fundamental science in which experiments and its interpretations are exploited to construct the physical laws. The laws of Physics explain how the universe works in a wide range, from subatomic scales to galaxies. Physics encompasses the study of fundamental rules of behavior of matter and energy at every scale, from the interactions of subatomic particles to the motion of everyday objects to the evolution of galaxies. These studies in Physics span from scientific research to the design and development of devices and instruments. The work done by Physicist has shaped our view of the nature and prompt modern technological developments.

Physical science consists of many subfields, including particle physics, nuclear physics, atomic and molecular spectroscopy, optics, solid state physics, health physics, computational physics, acoustics, astrophysics, and cosmology. Due to the multiplicity of fields, graduate-level physicists tend to specialize in one of these categories. Physicists in most categories may also choose to specialize in theoretical and experimental studies. Theoretical physicists use modeling along with mathematical concepts in order to analyze and predict the behavior of the physical world. Experimental physicists either to use natural observations and designed experiments in laboratory settings to confirm these theoretical projections or to develop devices and instruments.