Zostera marina, commonly known as eelgrass, is a type of seagrass found in shallow coastal waters. It plays a crucial role in marine ecosystems by providing habitat and food for various marine species, including fish and invertebrates. Eelgrass beds also help stabilize sediments and improve water quality by absorbing nutrients. This plant has long, ribbon-like leaves that can grow up to 1 meter in length. Zostera marina thrives in sandy or muddy substrates and can be found in both temperate and polar regions. Its presence is vital for maintaining biodiversity and supporting the overall health of coastal environments.