Immersive audio is an academic concept and research field concerned with generating and investigating auditory environments designed to significantly enhance a listener's sense of spatial presence, localization, and envelopment within a simulated or reproduced soundscape. It investigates the perception, technological methods, and systems for capturing, rendering, and reproducing sound to create realistic or compelling spatial cues, exploring their impact on user experience and applications across domains such as virtual/augmented reality, broadcasting, acoustics, and entertainment. Its significance lies in advancing the fidelity and engagement of mediated auditory experiences by moving beyond traditional channel-based or stereophonic limitations.