Wave theory is one of the most fundamental concepts in physics and has profoundly influenced the development of modern science and technology. From the propagation of sound and light to the functioning of wireless communication, medical imaging, and quantum mechanics, wave phenomena are deeply embedded in everyday life. This review article examines the historical evolution of wave theory, beginning with ancient philosophical ideas and progressing through the scientific contributions of Huygens, Newton, Young, Fresnel, Maxwell, and modern physicists. The article highlights the role of wave theory in understanding electromagnetic radiation, acoustics, optics, seismology, and quantum behaviour. Contemporary applications such as fiber-optic communication, mobile networks, satellite systems, ultrasound diagnostics, magnetic resonance imaging, renewable energy technologies, and artificial intelligence-assisted signal processing are discussed in detail. The paper also explores future perspectives, including quantum communication, gravitational wave astronomy, metamaterials, photonic computing, and next-generation wireless technologies. By integrating historical insights with modern applications and emerging trends, this article demonstrates that wave theory is not merely a theoretical framework but a cornerstone of contemporary civilization and future scientific advancement.