Ammonia is gaining attention as a sustainable fuel source due to its carbon-free nature, making it an attractive option to reduce carbon emissions significantly. It can be used in internal combustion engines or fuel-cell technology, similar to hydrogen. Toyota has introduced a high-power ammonia engine that drastically reduces carbon emissions compared to traditional gasoline engines. While ammonia production and usage already exist in various industries, challenges like nitrogen oxide emissions and infrastructure development need to be addressed for large-scale implementation. Ammonia shows promise in the maritime industry with pilot projects underway for ammonia-powered ships. It can also benefit trucks and buses, especially in areas lacking EV charging infrastructure. Additionally, ammonia can be utilized in power plants for electricity generation, offering a low-emission alternative to fossil fuels. Despite facing hurdles like NOx emissions and storage volume requirements, ammonia represents a viable option for cleaner energy in transportation and heavy industry. While ammonia may not dominate the passenger vehicle sector directly, it could complement hydrogen and electric vehicles in the broader push for sustainable transportation solutions.