Physics is the study of the physical universe with the goal of understanding it conceptually and modeling it mathematically. Developing a conceptual understanding allows a person to know not only what phenomena occur around them, but also why it happens. Developing mathematical models of the phenomena allows a person to predict limits to and future behavior of physical systems. Because of these goals, physics is foundational to all other areas of science and engineering.
Because physics is the foundation to all of the sciences, a student completing a BS in Physics has developed analytic skills and gained a solid understanding of physical principles that are valued in many disciplines. Specialization to a specific field of research occurs in graduate school. Cutting edge research in physics include developing solid state materials at the nano-scale, studying means of generating high temperature and pressure plasmas for fusion energy and analyzing showers of particles generated at high energy accelerators to determine the fundamental forces acting at the smallest scales of the universe. Interdisciplinary fields requiring a variety of expertise also attract physics students. These fields can include systems biology, which models regulatory networks at the cellular level, and earth systems modeling to study the impact of climate change. Physics students have also successfully transitioned into more conventional fields of study such as engineering, computer science and business.
If you have a love for both mathematics and the sciences, a major in physics may be a good fit for you. If you want to use physical principles to design and make things, you may want to consider a major in engineering, but if you want to know more deeply how and why things work, you will find a major in physics more fulfilling.