The photic zone is the upper layer of a body of water where sunlight penetrates, allowing photosynthesis to occur. This zone typically extends to about 200 meters deep in the ocean, depending on water clarity. It is crucial for marine life, as it supports a diverse range of organisms, including phytoplankton, which form the base of the aquatic food web. In the photic zone, light availability decreases with depth, leading to distinct ecological communities. Organisms such as fish, corals, and various invertebrates thrive here, relying on the energy produced by photosynthetic organisms. The health of the photic zone is vital for the overall productivity of marine ecosystems.