Ammonia is becoming more and more popular as a dense hydrogen vector and a zero-carbon fuel. An overview of the entire ammonia value chain is provided in this chapter. Each production pathway is benchmarked for energy efficiency and CO2 abatement potential, ranging from traditional Haber-Bosch to newer electrochemical, plasma, biological, pyrolysis-coupled, and totally renewable processes. The safety, volumetric density, and cost of several storage methods—pressurized, refrigerated, solid-state, liquefied, and porous-material absorption—are contrasted. The analysis concludes with transportation alternatives via pressurized marine boats, rail and road tankers, and dedicated pipelines, describing the legislative and infrastructure factors that will influence ammonia’s use in future low-carbon energy systems.