A native born citizen is a person who was born a citizen of a
certain country by virtue of the laws of that country . For
example, I am a native born citizen of the United States because I
was born a United States Citizen. This term shouldn't be confused
with natural born citizen, which a legal term unique to the United
States Constitution.
Addendum: In the U.S., native born is a subset of natural born.
All native borns are natural born but not all all natural borns are
native born. Anyone born in the U.S. (save for children born to
foreign diplomats or to foreign armed service members) are native
born, and consequently natural born.
As native born requires being born within the country, in this
case the U.S., a child born to citizen parents abroad is still
natural born, but not native born.