Sponsorship in general, helps communities to build a better future. It gives children the opportunity to learn a profession, to get a better job and finally it will improve their life situation.
You can give them the possibility to study as this is their only way out, out of their current situation. Their dream is to take their parents and siblings out of the slums, one day. By sponsoring you create this opportunity for them.
You support one child but this long lasting solution can help their entire family in the long run.