A model organism is a species that is studied extensively in scientific research because it is well-suited to experimental manipulation and provides valuable insights into biological processes that are relevant to other organisms, including humans. Model organisms are used in a wide range of scientific disciplines, including genetics, developmental biology, neuroscience, and ecology. Model organisms are chosen based on a variety of factors, including their genetic tractability, short generation time, ease of breeding, and similarity to other organisms of interest. Some commonly used model organisms include fruit flies (Drosophila melanogaster), nematode worms (Caenorhabditis elegans), zebrafish (Danio rerio), mice (Mus musculus), and yeast (Saccharomyces cerevisiae). By studying these model organisms, scientists can gain a better understanding of fundamental biological processes, such as gene regulation, development, and behavior. Insights gained from model organism research can be applied to other organisms, including humans, to improve our understanding of disease, genetics, and evolution.