Answer
Disperse systems, the focus of Zsigmondy's Nobel Prize-winning research, encompass heterogeneous mixtures where one substance is finely distributed throughout another. These systems, such as sols, emulsions, and foams, are ubiquitous in everyday life, from paints and cosmetics to pharmaceuticals and food products. Zsigmondy's groundbreaking work laid the foundation for understanding the behavior and properties of these complex systems.