Bargaining and negotiation are the most constructive ways to handle conflict. Economic prosperity, order, harmony, and enduring social relationships are more likely to be reached by parties who decide to work together toward agreements that satisfy everyone’s interests than by parties who fight openly, dominate one another, break off contact, or take their dispute to an authority to resolve. There are two major research paradigms: distributive and integrative negotiation. Distributive negotiation (“bargaining”) focuses on dividing scarce resources and is studied in social dilemma research. Integrative negotiation focuses on finding mutually beneficial agreements and is studied in decision-making negotiation tasks with multiple issues. Negotiation behavior can be categorized by five different styles: distributive negotiation is characterized by forcing, compromising, or yielding behavior in which each party gives and takes; integrative negotiation is characterized by problem-solving behavior in which parties search for mutually beneficial agreements. Avoiding is the fifth negotiation style, in which parties do not negotiate. Cognitions (what people think about the negotiation) and emotions (how they feel about the negotiation and the other party) affect negotiation behavior and outcomes. Most cognitive biases hinder the attainment of integrative agreements. Emotions have intrapersonal and interpersonal effects, and can help or hinder the negotiation. Aspects of the social context, such as gender, power, cultural differences, and group constellations, affect negotiation behaviors and outcomes as well. Although gender differences in negotiation exist, they are generally small and are usually caused by stereotypical ideas about gender and negotiation. Power differences affect negotiation in such a way that the more powerful party usually has an advantage. Different cultural norms dictate how people will behave in a negotiation. Aspects of the situational context of a negotiation are, for example, time, communication media, and conflict issues. Communication media differ in whether they contain visual and acoustic channels, and whether they permit synchronous communication. The richness of the communication channel can help unacquainted negotiators to reach a good agreement, yet it can lead negotiators with a negative relationship into a conflict spiral. Conflict issues can be roughly categorized in scarce resources (money, time, land) on the one hand, and norms and values on the other. Negotiation is more feasible when dividing scarce resources, and when norms and values are at play in the negotiation, people generally have a harder time to find agreements, since the usual give and take is no longer feasible. Areas of future research include communication, ethics, physiological or hormonal correlates, or personality factors in negotiations.