This talk is about how small liquid droplets placed on a surface evaporate and why understanding this process is important for application like cooling systems and inkjet printing. We study the evaporation process by developing, a simple yet accurate mathematical model called the Point Source Model (PSM). By applying the PSM approach, instead of tracking complex details like how the liquid surface moves or how mass transfers, PSM uses a mathematical shortcut to predict how fast droplets evaporate, how vapor spreads around them, and how the surface they sit on affects evaporation. The model was tested with experiments and matched well with observed results for different droplet sizes, humidity levels, and surface types. It also helped determine how close two droplets need to be before they start affecting each other’s evaporation. Beyond simple evaporation, the talk explores how heating the surface beneath the droplets changes the evaporation behavior of sessile droplets. At low temperatures, evaporation is mainly due to diffusion (random spreading of molecules). But as the surface gets hotter, vapor flow (natural convection) starts playing a larger role. The model accurately predicts when this shift happens. If time allows, the talk will also touch on how evaporation works when three droplets interact, using a correction factor to account for their positions. The findings are useful for improving technologies that rely on precise droplet control, such as inkjet printers, medical tests, and cooling systems.