This Case Study paper aims to study some key micro-finance concepts through the concrete study case of the Palmas Bank. The research undertaken for this paper is essentially qualitative and descriptive since the data collected were from documents realized by the institution itself, books, articles, and documentaries. We divided the paper into "The Organization" and "Specific Area of Interest". In the first topic, we split it into the background, how the organization works, and its goals. For the second one, we divided it into the scope of activities, uniqueness, relevance, innovation, and success points. Besides the sources, we also highlighted some public visibility in the references.