Core polysaccharides are complex carbohydrates made up of long chains of sugar molecules. They play a crucial role in the structure and function of various biological systems, including the cell walls of bacteria and plants. These polysaccharides can provide energy storage and serve as structural components, helping to maintain the integrity of cells. In the context of immunology, core polysaccharides are often found in the outer membrane of Gram-negative bacteria. They can trigger immune responses in humans and other organisms, making them important in the study of vaccines and pathogen recognition. Understanding core polysaccharides can help in developing treatments for infections and diseases.