This document defines and compares friends and acquaintances. A friend is defined as someone you know and like who is not family, while an acquaintance is someone you know slightly but who is not a close friend. Key differences are that friends share a deeper level of interaction and communication, support each other's interests, help each other, and know intimate details about each other, whereas acquaintances interact superficially and do not often spend time together or feel obligated to help each other. Friendliness refers to polite behavior like smiling, whereas friendship requires trust and mutual liking between parties.