Foraminifera are tiny, single-celled organisms found in marine environments. They belong to the group of protists and are characterized by their intricate shells, called tests, which can be made of calcium carbonate or silica. These shells come in various shapes and sizes, often resembling tiny chambers or spirals. Foraminifera play a crucial role in the ocean ecosystem. They serve as important indicators of environmental conditions and are used in paleoclimatology to study past climate changes. Additionally, their shells contribute to the formation of sedimentary rocks and are essential in the carbon cycle, helping to regulate atmospheric carbon dioxide levels.