Epidemiology is a core discipline within public health sciences dedicated to studying the patterns and causes of disease and other health-related outcomes in specified populations. By applying rigorous statistical and mathematical methods, this field determines the distribution of illness, investigating who is affected, where it occurs, and when incidence rates change over time. The objective of epidemiological analysis is to identify specific determinants, such as environmental exposures or behavioral risk factors, that contribute to adverse health states. This foundational research is critical for informing public health interventions, developing surveillance systems, and guiding the implementation of preventative measures designed to reduce the burden of disease across a community.