Neoconservatism is an American political philosophy espousing some tenets of traditional conservatism which introduces, or carries over, several distinctions derived from various Enlightenment and post-Enlightenment philosophies.
Neoconservatives tend to be fairly committed to restrictions on abortion, opposed to redefinition of marriage to recognize the validity of homosexual unions, in favor of unrestricted ownership of firearms, etc. These beliefs are shared with other conservatives.
Neoconservatives are not opposed to government expansion in principle, although they may selectively oppose certain instances of it. They see bureaucracy as a natural development of governance, especially on as grand a scale as a nation the size of the United States, and therefore do not seek to hinder its growth. They are statists.
Neoconservatism advocates an interventionist, aggressive foreign policy. Central to this is the doctrine of American exceptionalism. Neoconservatives view America as one of, if not the only, remaining superpowers with a concomitant responsibility to act to resolve crises and support perceived national interests.