Wireless communications is a multidisciplinary research field and engineering discipline dedicated to the transmission and reception of information signals between devices or locations without the use of physical conductors. This domain investigates the fundamental principles, technologies, and systems enabling the transfer of data, voice, and video through channels such as radio frequency, microwave, infrared, and visible light. Key areas of inquiry include modulation and coding theory, propagation modeling, antenna design, network architecture and protocols, spectrum management, interference mitigation, and security, all aimed at achieving reliable, efficient, and ubiquitous connectivity to support a wide range of applications from mobile networking and broadcasting to satellite communications and the Internet of Things.