A dominant species is a type of organism that has a significant influence on its environment and community. This species often has a large population size or occupies a key ecological role, affecting the availability of resources for other species. Examples of dominant species include certain trees in a forest or specific predators in an ecosystem. In ecological terms, dominance can be measured by factors such as biomass, abundance, or the ability to outcompete other species for resources. The presence of a dominant species can shape the structure and function of an ecosystem, impacting biodiversity and the overall health of the environment.