An aquatic ecosystem is a community of living organisms, such as plants, animals, and microorganisms, that interact with each other and their environment in water. These ecosystems can be found in various water bodies, including oceans, rivers, lakes, and wetlands. They play a crucial role in maintaining biodiversity and supporting life on Earth. Aquatic ecosystems are categorized into two main types: freshwater and marine. Freshwater ecosystems include rivers, lakes, and ponds, while marine ecosystems encompass oceans and seas. Each type has unique characteristics and supports different species, contributing to the overall health of the planet.