  This review paper examines the concept and advancements in the evolving
landscape of Dual-functional Radar Communication (DFRC) systems. Traditionally,
radar and communication systems have functioned independently, but current
research is actively investigating the integration of these functionalities
into a unified platform. This paper discusses the motivations behind the
development of DFRC systems, the challenges involved, and the potential
benefits they offer. A discussion on the performance bounds for DFRC systems is
also presented. The paper encompasses a comprehensive analysis of various
techniques, architectures, and technologies used in the design and optimization
of DFRC systems, along with their performance and trade-offs. Additionally, we
explore potential application scenarios for these joint communication and
sensing systems, offering a comprehensive perspective on the multifaceted
landscape of DFRC technology.
