Nonthermal plasma technology has emerged as a versatile tool for environmental remediation, energy conversion, and chemical processing due to
its ability to generate reactive species at low bulk gas temperatures. One of the most promising advancements in this field is the integration of nonthermal plasma with catalytic systems, which synergistically enhance reaction rates, selectivity, and energy efficiency. This review provides a comprehensive analysis of the principles, mechanisms, and applications of nonthermal plasma -catalyst systems. Key findings from the literature are discussed, including the fundamental plasmacatalyst interactions, the role of catalyst design, and the influence of critical parameters such as power, gas composition, and reactor configuration on system performance. Prominent applications, including NOx removal, volatile organic compound degradation, hydrogen production, and CO2 reduction, are examined in detail. The paper identifies challenges such as catalyst deactivation and energy inefficiency, offering insights into future research directions, including advanced material development and innovative reactor designs, to accelerate the industrial adoption of plasma-catalyst technologies.