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 the growth of phytoplankton, which forms the base of the aquatic food web. In the photic zone, various organisms thrive, including fish, corals, and other marine species that rely on sunlight for energy. The presence of light in this zone creates a vibrant ecosystem, making it essential for the health of the entire aquatic environment, including oceans and lakes.