Social support is the perception and actuality that one is cared for, has assistance available from other people, and most popularly, that one is part of a supportive social network. These supportive resources can be emotional (e.g., nurturance), informational (e.g., advice), or companionship (e.g., sense of belonging); tangible (e.g., financial assistance) or intangible (e.g., personal advice). Social support can be measured as the perception that one has assistance available, the actual received assistance, or the degree to which a person is integrated in a social network. Support can come from many sources, such as family, friends, pets, neighbors, coworkers, organizations, etc. Government-provided social support may be referred to as public aid in some nations. Social support is studied across a wide range of disciplines including psychology, communications, medicine, sociology, nursing, public health, education, rehabilitation, and social work. Social support has been linked to many benefits for both physical and mental health, but "social support" (e.g., gossiping about friends) is not always beneficial. Social support theories and models were prevalent as intensive academic studies in the 1980s and 1990s, and are linked to the development of caregiver and payment models, and community delivery systems in the US and around the world. Two main models have been proposed to describe the link between social support and health: the buffering hypothesis and the direct effects hypothesis. Gender and cultural differences in social support have been found in fields such as education "which may not control for age, disability, income and social status, ethnic and racial, or other significant factors". Categories and definitions Distinctions in measurement Social support can be categorized and measured in several different ways. There are four common functions of social support: Emotional support is the offering of empathy, concern, affection, love, trust, acceptance, intimacy, encouragement, or caring. It is the warmth and nurturance provided by sources of social support. Providing emotional support can let the individual know that he or she is valued. Tangible support is the provision of financial assistance, material goods, or services. Also called instrumental support, this form of social support encompasses the concrete, direct ways people assist others. Informational support is the provision of advice, guidance, suggestions, or useful information to someone. This type of information has the potential to help others problem-solve. Companionship support is the type of support that gives someone a sense of social belonging (and is also called belonging). This can be