Depending on where you are in the world you might refer to what we see here as either a slum or a shanty town. Both mean effectively the same thing; a badly planned and constructed series of dwellings for the poor. The kinder way to refer to them is as an 'informal settlement,' but as the slums stay where they are for decades, it doesn't feel right to refer to them as 'informal.' For many people, this is their whole life.
A slum home is better than no home at all, but it's still not right in when we live in a world of such economic riches. Until overpopulation is brought under control, though this will continue to happen. Many nations just cannot build fast enough to accommodate all the new lives that are born within their borders. People make their way to the slums and disappear there, with no real address or identity and little prospect of ever making it out again.