What is a friend? Well, according to Answers.com, a friend is:
A person whom one knows, likes, and trusts. A person whom one knows; an acquaintance. A person with whom one is allied in a struggle or cause; a comrade. One who supports, sympathizes with, or patronizes a group, cause, or movement: friends of the clean air movement.Friend A member of the Society of Friends; a Quaker.Wikipedia