Slum, or favela slum within the meaning of the Assembly. Means that the decline of the city that is unique. Houses built below standard. Unkempt slob The lack of security and stability. According to the UN The proportion of people living in slums in urban areas in the 2533-2548 period, down from 47 percent to 37 percent, however, because of the growing world population. Especially in the urban population. Residents in slums in urban areas has increased accordingly. Number of people living in the slums around the world, has about one billion people. And will increase to two billion people in the year 2573 the characteristics of slums may be different in each region. What is common is that the residents are very poor or socially disadvantaged. Buildings in Warren range from simple huts or shelters to permanent structures preserved. Most slums lack clean water, sanitation, electricity and other utilities.