Rape is a sexual assault in which a person uses his penis or other object to commit vaginal, oral, or anal penetration of a victim, by force or threat of force, against the victim's will, or when the victim is physically and/or mentally unable to give consent.
Date rape is simply a rape that happens between two parties who are dating.
Acquaintance rape is a rape that happens when the victim and perpetrator are acquainted. The majority of rapes are actually acquaintance rapes, because in almost every case, the rapist gets to know the victim at least enough for her to drop her guard. Once she lets him into her confidence and begins to trust him, he strikes. (Opposing Viewpoints)