Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. It is one of the most fundamental scientific disciplines, with its main goal being to understand how the universe behaves. Physics deals with a wide variety of systems, from elementary particles to the largest superclusters of galaxies. Key aspects of physics include:

• Fundamental laws: Physics aims to discover and formulate the fundamental laws of nature that govern the behavior of matter and energy.

• Models: Physicists try to develop conceptual and mathematical models that describe interactions between entities and that can be used to extend our understanding of how the universe works at different scales.

• Applications: Physics has many practical applications, such as the design of equipment and techniques used to study the human body, as well as diagnose and treat diseases. It also plays an important role in other natural sciences, such as astrophysics, geophysics, and biophysics.

Physics is sometimes called the "fundamental science" because it covers a wide range of phenomena and aims to describe the various phenomena that occur in nature in terms of simpler phenomena. It is a constantly evolving field, with new discoveries and theories leading to new questions and areas of research.