Soft materials have exceptional mechanical, optical or functional properties that find applications in many industrial sectors and in society in general. Examples of such systems are colloids, emulsions, polymers, surfactants. These are the building blocks of biological organisms, blood and other cells, DNA, proteins, etc.. This kind of materials is also found in drug delivery systems and consumer products such as shampoo, shaving cream, paint, plastics and foodstuffs. They are called 'Soft' because they flow or deform easily under external forces, which can happen because they are structured on mesoscopic length scales.