A native species is any species that has lived in an area for a long time, generally at least thousands of years, and without having been introduced to that area by humans. All species are native to some place. An endemic species is a native species that cannot be found living naturally anywhere else.
This contrasts with an introduced species, or a non-native species, which is a species that was introduced with human assistance, either intentional or accidental, to a new habitat in which it was not previously found. An exotic species is an introduced species that is not native to the continent on which it is now found. A naturalized species is an introduced species that does not need human assistance to reproduce and maintain itself over time in an area where it is not native. An invasive species is a naturalized species that outcompetes one or more native species and may cause ecological, environmental, and/or economic damage.
Humans are not generally considered to be an invasive species because they were not introduced to any region. Rather, they underwent a natural range expansion.