Disease spread simulation is a method used to model how infectious diseases, like COVID-19 or influenza, can spread through populations. By using mathematical models and computer programs, researchers can predict how a disease might move from person to person, taking into account factors like transmission rates, population density, and social behavior. These simulations help public health officials understand potential outbreaks and evaluate the effectiveness of interventions, such as vaccination or quarantine. By visualizing the spread of a disease, they can make informed decisions to protect communities and reduce the impact of epidemics.