Organisms are living entities that can be classified into various categories based on their characteristics. They can be unicellular, like bacteria, or multicellular, such as plants and animals. Each organism plays a vital role in its ecosystem, contributing to the balance of life on Earth. The study of organisms encompasses various fields, including biology, ecology, and zoology. Understanding organisms helps scientists learn about life processes, evolution, and the interdependence of species. This knowledge is crucial for conservation efforts and maintaining biodiversity in our environment.