The sunlight zone, also known as the euphotic zone, is the upper layer of the ocean where sunlight penetrates, allowing photosynthesis to occur. This zone typically extends to about 200 meters (656 feet) deep, depending on water clarity. It is home to a diverse range of marine life, including plankton, fish, and coral reefs, which thrive in the warm, well-lit waters. In the sunlight zone, the availability of light supports the growth of phytoplankton, the primary producers in the ocean. These tiny organisms form the base of the marine food web, providing energy for larger creatures like zooplankton and various fish species. The sunlight zone is crucial for maintaining the health of ocean ecosystems.