Row houses are a type of residential building that consists of a series of identical or similar homes connected in a row. Each house shares one or more walls with its neighbors, creating a compact living space. This architectural style is often found in urban areas where land is limited, allowing for efficient use of space. Typically, row houses have a uniform appearance, with similar facades and rooflines. They can vary in size and design, but they usually feature multiple stories and small front yards. This style is popular in cities like Philadelphia and London, where historical row houses contribute to the character of the neighborhoods.