A Census Block is the smallest geographic unit used by the U.S. Census Bureau for data collection and analysis. These blocks are typically defined by physical boundaries, such as streets or rivers, and can vary in size from a single city block to large rural areas. Each block contains a specific number of housing units and residents, making it essential for detailed demographic studies. Census blocks are crucial for various applications, including urban planning, political representation, and resource allocation. The data collected from these blocks helps governments and organizations understand population trends and make informed decisions that affect communities.