which popularised the notion of home as house. A result of the longstanding association between home and women, 18th century English women, of upper-class status, were scorned for pursuing activities outside of the home, thus seen to be of undesirable character. The concept of home took on unprecedent prominence by the 18th century, reified by cultural practice. The concept of a smart home arose in the 19th century in turn with electricity having been introduced to homes in a limited capacity. The distinction between home and work formulated in the 20th century, with home acting as sanctuary. Modern definitions portray home as a site of supreme comfort and familial intimacy, operating as a buffer to the greater world. Common types The concept of home is one with multiple interpretations, influenced by one's history and identity. People of differing ages, genders, ethnicities and classes may have resultingly different meanings of home. Commonly, it is associated with various forms of abodes such as wagons, cars, boats or tents although it is equally considered to extend beyond the space, in mind and emotion. The space of a home need not be significant or fixed though the boundaries of home are often tied to the space. There have been multiple theories regarding one's choice of home with the residential conditions of their childhood often reflected in their later choice of home. According to Paul Oliver, the vast majority of abodes are vernacular, constructed in accordance with the residents' needs. House A house is a single-unit residential building. It may range in complexity from a rudimentary hut to a complex structure of wood, masonry, concrete or other material, outfitted with plumbing, electrical, and heating, ventilation, and air conditioning systems. The social unit that lives in a house is known as a household. Most commonly, a household is a family unit of some kind, although households may also be other social groups, such as roommates or, in a rooming house, unconnected individuals. Some houses only have a dwelling space for one family or similar-sized group; larger houses called townhouses or row houses may contain numerous family dwellings in the same structure. A house may be accompanied by outbuildings, such as a garage for vehicles or a shed for gardening equipment and tools. A house may have a backyard or a front yard or both, which serve as additional areas where inhabitants can relax or eat. Houses