Most of the vehicles running in the world with internal combustion engines use fossil fuels. The commonly used fuels available in the market are gasoline, diesel and CNG. These fuels are becoming costlier every year and generate pollutants through exhaust gases. Hence in the market, electric vehicles are effectively providing pollution-free solutions in the passenger car and lightweight carrier vehicle segments. However, off-road, heavy-duty, and stationary applications with a high load factor, in general are less favorable for battery electric scenarios since frequent charging will be mandatory and time-consuming. Hence, for these ICE applications, the replacement of an internal combustion engine is quite difficult. There are various renewable fuels like Ammonia, Methanol, Biodiesel, etc. under research tests and study. As these are renewable fuels, the cost of these fuels can be lowered during mass production. Here, the idea of ammonia as an alternate fuel comes, which can solve the problem of scarcity of fossil fuel, generation of greenhouse gas (CO2) and instant electricity requirements. This technical paper covers the feasibility of Ammonia fuel in the internal combustion engine based on the research studies and tests performed for analysis. This study will explain the Ammonia fuel characteristics & compare them with other fuels, available technologies of combustion in large bore engines, storage & transport maturity, the impact of change in lambda on emission during combustion and challenges in fuel handling due to the toxicity. This will comprise the internal combustion engine exhaust gas emission trend with Ammonia fuel. Also, the scope of modification in the existing engines to adopt the 'Ammonia fuel' with help of modern design and simulation technology will be covered.