<p>The proliferation of renewable energy sources (RESs) in power systems leads to reduced inertia, increased intermittency, and the need for transmission network modifications, all of which pose significant challenges for frequency regulation. This article reviews the utilization of electric vehicles (EVs) for frequency regulation in emerging electricity networks, focusing on Virtual Inertia Control (VIC), primary frequency control (PFC), and secondary frequency control (SFC). EVs, with their fast response capabilities and bidirectional power electronics, can effectively provide virtual inertia, enhancing grid stability. Through vehicle-to-grid (V2G) technology for droop control or using demand response, EVs can participate in PFC by rapidly adjusting charging and discharging rates and in SFC by offering sustained power adjustments. Various modeling techniques for simulating EV behavior in frequency regulation, such as aggregate, individual-based, hybrid, and agent-based modeling, are discussed. Practical insights from case studies demonstrate the significant potential of EVs in enhancing grid stability, especially in systems with high RES penetration. Moreover, the article addresses critical challenges, including communication infrastructure, battery degradation, market mechanisms, and regulatory frameworks, and presents advanced solutions such as decentralized control algorithms, optimized V2G strategies, and vehicle-to-everything (V2X) technology. The study also emphasizes the economic and behavioral factors influencing EV participation, such as financial incentives and owner willingness to engage in V2G activities. By synthesizing findings across technical, regulatory, and market domains, the review underscores the transformative potential of EVs in frequency regulation, offering actionable insights and future research directions to enhance the resilience and sustainability of modern power systems.</p>