Chlorin derivatives have attracted considerable attention over the last three decades in different scientific fields. These compounds
are present in a large number of bacteria, fungi and in all plants found on Earth. Since the discovery of these pigments, chemists,
biologists, medical professionals and materials scientists have devoted pronounced efforts in order to develop new synthetic methods and
discover useful applications for these compounds. In this review we wish to cover the main natural chlorins, their natural sources, synthetic
approaches to access these compounds, and the major applications.