Solution:Slums are defined in the census on the basis of (a) Inadequate infrastructure and (c) Overcrowding. Slums are characterized by insufficient living spaces, poor structural quality of housing, lack of access to clean water, sanitation, and other essential public services.Overcrowding is also a common feature of slums, leading to poor living conditions and health issues. The definition does not primarily focus on unemployment or poverty, even though these factors may be prevalent in slum areas. Understanding the characteristics that define slums is crucial for urban planning and development policies, as it helps in targeting interventions to improve living conditions, infrastructure, and access to essential services.