Row houses are a type of residential building that consists of a series of identical or similar homes connected in a straight line. Each house shares one or two walls with its neighbors, creating a compact and efficient use of space. This architectural style is commonly found in urban areas, where land is limited and housing demand is high. Typically, row houses have multiple stories and feature a front porch or small yard. They often have a uniform appearance, with similar facades and architectural details. This design promotes a sense of community while maximizing the number of homes in a given area, making it a popular choice in cities like Philadelphia and London.