Photosynthesis is an indispensable process that provides energy for all living organisms. Photosystem is a term that describes a group of pigments and proteins that work together to carry out the essential conversion of light energy into chemical energy. Synonyms for the word photosystem include light-harvesting complexes, antenna complexes, and photosynthetic reaction centers. Light-harvesting complexes capture photons from the sun and transfer them to the reaction centers, where chemical reactions take place. Antenna complexes are a network of pigments that absorb light energy and funnel it into photosystem I or II. Lastly, photosynthetic reaction centers are complexes that act as the energy conversion centers by catalyzing redox reactions. Understanding these synonyms of photosystem helps to comprehend the process of photosynthesis and its importance to life.