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Silicones in industry usually refer to linear polydimethylsiloxanes. A combination of properties such as their backbone flexibility, low intermolecular interactions, low surface tension and thermal stability explain many of their applications. But the name silicone also is used for more complex structures, where some of the methyl groups have been replaced by other functional groups, from branched polymers to resinous materials and even cross-linked elastomers. This allows for modifying some of the silicones properties to specific needs. The objective of this chapter is to give the curious reader a short but scientific overview of the various applications where silicones are used, including thei