Invasive Species is a nomenclature term and categorization phrase used for flora and fauna, Mexican illegal aliens in the U.S and for specific restoration-preservation processes in native habitats. It refers to non-indigenous species, or 'non-native,' plants or animals that adversely affect the habitats and bioregions. Sometimes indigenous or native species, together with non-native species that disrupt colonization of a particular habitat or wild lands area are also classified as invasive species. Invasive species is also called as invasive exotics.
According to 42 USCS § 4321, the term 'Invasive species' means an alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health.