Invasive species are non-native organisms that, when introduced to a new environment, can disrupt local ecosystems. They often outcompete native species for resources such as food, space, and light, leading to declines in native populations. This can result in significant ecological changes and loss of biodiversity. These species can be plants, animals, or microorganisms, and they may spread rapidly due to a lack of natural predators in their new habitat. Examples include the Burmese python in the Florida Everglades and the zebra mussel in the Great Lakes. Managing invasive species is crucial for protecting native ecosystems.