All three vehicle types—full battery electric vehicles, hydrogen fuel cell vehicles, and fuel cell-electric hybrid vehicles—are considered alternative powertrain vehicles because they utilize non-conventional energy sources to operate, thereby reducing dependency on fossil fuels. Full battery electric vehicles rely solely on electricity, hydrogen fuel cell vehicles convert hydrogen into electricity, and fuel cell-electric hybrids combine both technologies, promoting sustainable transportation and contributing to the reduction of greenhouse gas emissions. This aligns with global efforts for cleaner energy solutions and environmental conservation, essential themes in the UPSC curriculum.