Eelgrass, Zostera marina, is a type of underwater flowering plant found in shallow coastal waters, forming dense seagrass meadows. It plays a vital role in marine ecosystems by stabilising sediments, reducing coastal erosion, and providing habitat and nursery grounds for fish, shellfish, and other wildlife. Eelgrass also improves water quality by absorbing nutrients and carbon dioxide, making it a powerful natural tool for carbon storage and climate change mitigation. However, eelgrass meadows are under threat from pollution, boat damage, and climate change, highlighting the need for conservation and restoration efforts.