In ecology, a community refers to groups of different organisms living in a habitat. A community is a set of populations of different species living and interacting in a particular place at the same time. These populations interact with each other in different ways such as competition, predation, and mutualism, and their interactions can have significant effects on the entire ecosystem. Therefore, the community is an important level of organization in ecology, which helps us understand the complex relationships among different species and their impact on the environment.