Recent research used a method called density functional theory (DFT) to examine how a thin layer of 2-dimensional Transition metal dichalcogenide (TMDC) WTe2 monolayer (ML) interacts with silver (Ag) and certain gases present in human breath. We explored how this interaction could assist in identifying particular volatile organic compounds (VOCs) such as acetone (CH3O6), ethanol (C2H5OH), methanol (CH3OH), toluene (C7H8), and formaldehyde (CH2O), Together with the gases causing interference, like (CO2) and (H2O), in exhaled breath. The WTe2 layer usually acts as a semiconductor, but when combined with Ag, it becomes metallic, enhancing its ability to detect these VOCs. They analyzed various properties such as structural, electronic, adsorption, Hirshfeld charge analysis, and sensing properties of the studied material. The findings highlight ethanol as particularly effective in interacting with the layer and remaining detectable for an extended period. In conclusion, they propose that this Ag-decorated WTe2 layer holds potential for creating sensitive sensors for breath analysis at room temperature.