Condensed matter physics is a fundamental branch of physics that explores the physical properties of solid and liquid states of matter. It seeks to understand how the collective behavior of a large number of atoms and electrons gives rise to the diverse physical properties observed in materials. This field not only provides insight into the fundamental principles governing matter but also drives technological advancements in electronics, nanotechnology, and quantum computing.

Historically, condensed matter physics evolved from solid-state physics, which primarily focused on crystalline solids and their electronic properties. The development of quantum mechanics in the early 20th century revolutionized the field, leading to an in-depth understanding of electronic band structures and the behavior of semiconductors. With time, the study expanded to include a broader range of materials, including amorphous solids, polymers, superconductors, and complex fluids. Today, condensed matter physics plays a crucial role in material science, engineering, and applied physics, shaping modern technological advancements.

One of the key aspects of condensed matter physics is the study of crystal structures and atomic interactions. The arrangement of atoms in a solid determines its electronic, thermal, and mechanical properties. Crystals are defined by periodic arrangements of atoms, forming lattice structures that can be analyzed using mathematical tools like the reciprocal lattice and Brillouin zones. In contrast, amorphous materials, such as glass, lack long-range order but still exhibit unique physical properties. The bonding mechanisms in solids—ionic, covalent, metallic, and van der Waals interactions—play a crucial role in determining the stability and functionality of materials.