Forgiveness, in a psychological sense, is the intentional and voluntary process by which one who may initially feel victimized or wronged, goes through a change in feelings and attitude regarding a given offender, and overcomes the impact of the offense including negative emotions such as resentment and a desire for vengeance (however justified it might be). Theorists differ, however, in the extent to which they believe forgiveness also implies replacing the negative emotions with positive attitudes (i.e. an increased ability to tolerate the offender). In certain legal contexts, forgiveness is a term for absolving or giving up all claims on account of debt, loan, obligation, or other claims.

On the psychological level, forgiveness is different from simple condoning (viewing an action as harmful, yet to be “forgiven” or overlooked for certain reasons of “charity”), excusing or pardoning (merely releasing the offender from responsibility for an action), or forgetting (attempting to somehow remove from one's conscious mind, the memory of a given “offense"). In some schools of thought, it involves a personal and "voluntary" effort at the self-transformation of one's own half of a relationship with another, such that one's own self is restored to peace and ideally to what psychologist Carl Rogers has referred to as “unconditional positive regard” towards the other.

As a psychological concept and virtue, the benefits of forgiveness have been explored in religious thought, social sciences and medicine. Forgiveness may be considered simply in terms of the person who forgives including forgiving themselves. This can be in terms of the person forgiven or in terms of the relationship between the forgiver and the person forgiven. In most contexts, forgiveness is granted without any expectation of restorative justice, and without any response on the part of the offender (for example, one may forgive a person who is incommunicado or dead). In practical terms, it may be necessary for the offender to offer some form of acknowledgment, an apology, or even just ask for forgiveness, in order for the wronged person to believe themselves able to forgive as well.

Social and political dimensions of forgiveness involves the strictly private and religious sphere of "forgiveness". The notion of "forgiveness" is generally considered unusual in the political field. However, Hannah Arendt considers that the "faculty of forgiveness" has its place in public affairs. The philosopher believes that forgiveness can liberate resources both individually and collectively in the face of the irreparable. During an investigation in Rwanda on the discourses and practices of forgiveness after the 1994 genocide, sociologist Benoit Guillou illustrated the extreme polysemy (multiple meanings) of the word "forgiveness" but also the eminently political character of the notion. By way of conclusion of his work, the author proposes four main figures of forgiveness to better understand, on the one hand, ambiguous uses and, on the other hand, the conditions under which forgiveness can mediate a resumption of social link.

Most world religions include teachings on the nature of forgiveness, and many of these teachings provide an underlying basis for many varying modern day traditions and practices of forgiveness. Some religious doctrines or philosophies place greater emphasis on the need for humans to find some sort of divine forgiveness for their own shortcomings, others place greater emphasis on the need for humans to practice forgiveness of one another, yet others make little or no distinction between human and divine forgiveness.

The term forgiveness can be used interchangeably and is interpreted many different ways by people and cultures. This is specifically important in relational communication because forgiveness is a key component in communication and the overall progression as an individual and couple or group. When all parties have a mutual viewing for forgiveness then a relationship can be maintained. "Understanding antecedents of forgiveness, exploring the physiology of forgiveness, and training people to become more forgiving all imply that we have a shared meaning for the term".