Marine pollution is the introduction of substances or energy into the marine environment by human activity, resulting in harmful effects on living resources, ecosystem health, and human uses of the ocean. This concept underpins a multidisciplinary research field that systematically investigates the sources, transport, fate, and ecological impacts of diverse contaminants. Key characteristics of this field include the study of various pollutant types (e.g., chemical, plastic, nutrient, noise, thermal), their interactions with biological systems and environmental processes, and their consequences for marine biodiversity, ecosystem structure, and function across different scales. Its significance lies in assessing risks to marine and human health, understanding critical environmental changes, and informing mitigation, remediation, and sustainable management strategies for coastal and oceanic environments.