This review explores the advancements and challenges in using ammonia as a zero-carbon fuel, highlighting its potential as a viable alternative to fossil fuels. Ammonia, produced from both fossil and renewable sources, offers advantages such as lower storage and transportation costs, easier handling, and better commercial viability compared to hydrogen. However, it faces key challenges, including NOx emissions, low flame speed, and material integrity issues. The article discusses the historical data on ammonia production and future projections, emphasizing the need for research and development to address these challenges. It also addresses the fundamental complexities of ammonia combustion, which are crucial for its practical and industrial implementation. The review aims to provide insights from various industrial partners working on green ammonia technologies, making it a comprehensive resource for understanding the current state and future prospects of ammonia-based energy systems.This review explores the advancements and challenges in using ammonia as a zero-carbon fuel, highlighting its potential as a viable alternative to fossil fuels. Ammonia, produced from both fossil and renewable sources, offers advantages such as lower storage and transportation costs, easier handling, and better commercial viability compared to hydrogen. However, it faces key challenges, including NOx emissions, low flame speed, and material integrity issues. The article discusses the historical data on ammonia production and future projections, emphasizing the need for research and development to address these challenges. It also addresses the fundamental complexities of ammonia combustion, which are crucial for its practical and industrial implementation. The review aims to provide insights from various industrial partners working on green ammonia technologies, making it a comprehensive resource for understanding the current state and future prospects of ammonia-based energy systems.