Colloidal systems is an academic concept and interdisciplinary research field focused on the study of heterogeneous mixtures where one substance is dispersed uniformly throughout another substance. It investigates the physical and chemical properties of these systems, particularly the interactions between the dispersed phase (particles typically ranging from 1 nm to 1 µm) and the continuous phase, and the interfaces between them. Key characteristics investigated include particle size-dependent phenomena, stability mechanisms, and emergent properties arising from the large surface area-to-volume ratio of the dispersed phase. The significance of studying colloidal systems lies in their fundamental role in numerous natural processes and their critical importance in diverse technological applications across chemistry, materials science, biology, and engineering.