Physics is the branch of science that studies matter and energy and their interactions with each other.  It is concerned with understanding the fundamental principles that govern the behavior of the universe, from the smallest particles to the largest structures.  Physicists study a wide range of phenomena, including motion, forces, energy, light, heat, and electricity.  They use mathematical models and experimental techniques to observe and measure these phenomena, and to develop theories that explain them.

Pure physics is the study of matter and energy and their relationships (properties) to each other.  Applied physics is a combination of pure physics and engineering put to practical use.  Some of the key areas of physics include classical mechanics, which deals with the motion of macroscopic objects, and quantum mechanics, which deals with the behavior of subatomic particles.  Other areas of physics include thermodynamics, electromagnetism, optics, and astrophysics.

The work of physicists has many practical applications, ranging from the development of new materials and technologies to advances in medicine and energy production.  For example, physicists have contributed to the development of nuclear energy, lasers, semiconductors, and medical imaging technologies such as X-rays and MRI.

Physics is also a foundational discipline for many other scientific fields, such as chemistry, biology, and engineering.  Physicists work in a variety of settings, including universities, research laboratories, and private industry.  Overall, physics plays a critical role in advancing our understanding of the natural world and developing new technologies that improve our lives.  It is an exciting and constantly evolving field, with new discoveries and breakthroughs being made every day.

You probably think that chemistry is part of physics, yes and no.  Both are physical sciences and both study the structure and properties of matter.  Physics deals with understand the universe in a fundamental way.  Chemistry is how substances interact with each other.

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Major Branches of Physics

Classical Physics (1600 - 1900)  -  A branch of physics theories that come before the modern, more complete, or more widely applicable theories.
Modern Physics (1900 - now)  -  A branch of physics starting in the early twentieth century with the revolutionary theories of general and special relativity and the quantum theory.