A plant that grows in water is referred to as an "aquatic plant." Aquatic plants can be fully submerged, floating, or partially submerged in water. They play essential roles in their ecosystems, including providing habitat for various aquatic organisms, helping to stabilize the sediment, and improving water quality through photosynthesis and oxygen production. Examples of aquatic plants include water lilies, cattails, and reeds. Each type has unique adaptations that allow it to thrive in its aquatic environment, contributing significantly to both natural water bodies and designed aquatic habitats like ponds and aquariums.