A micelle is a collection of lipid molecules that are amphipathic surfactants that are distributed in a liquid to create a colloidal suspension (also known as associated colloidal system). The hydrophilic "head" sections of a typical micelle in water form an aggregation while the hydrophobic single-tail areas are trapped in the micelle centre. This phase is brought on by the way single-tail lipids pack themselves into a bilayer. The micelle forms as a result of the difficulties in filling the whole volume of a bilayer while accommodating the area per head group imposed on the molecule by the hydration of the lipid head group. A normal-phase micelle is this kind of micelle (oil-in-water micelle). With the tails extending outward, inverse micelles have their head groups in the center. The shape of micelles is roughly spherical. Bilayers, ellipsoids, and other forms of solids, such as cylinders, are among the additional phases that could exist. The molecular geometry of a micelle's surfactant molecules and factors like the concentration, temperature, pH, and ionic strength of the solution play a role in determining the micelle's shape and size. According to their polymorphism, many lipids go through a process called micellisation, which is the process of forming micelles.