Physics is the scientific study of matter, energy, and the interactions between them. It concerns the fundamental constituents of the universe, their motion and behavior through space and time, and the forces that act upon them. The word physics originates from the Greek term for "nature" and "natural order" and the field aims to understand natural phenomena by describing them through fundamental principles and laws. Physics is considered one of the most fundamental sciences since it provides the basis for understanding other sciences, such as chemistry and biology, linking observable phenomena to their underlying causes. It covers a wide array of topics including motion, force, energy, electromagnetism, thermodynamics, quantum mechanics, and relativity, among others. Physicists use mathematical models and experimental evidence to explore and explain how the universe works on every scale, from subatomic particles to galaxies.