Supramolecular chemistry provides ingenious strategies for the elaboration of functional systems from readily available molecular components. These methodologies have been used for the development of sensors, catalysts, energy or electron transfer systems, agents for photodynamic therapy and so forth. This book reviews the chemistry, types and applications of supramolecular systems. Chapter One discusses the design and applications of supramolecular systems based on (thia)calixarene ammonium derivatives. Chapter Two gives an overview of the methods of stabilisation of the elusive bare {V6O19} structure by different capping moieties and substituents, illustrates the main synthetic strategies toward the formation of fully-oxidised {VV6}, mixed-valence {VV/VI6}, and fully reduced {VIV6} trisalkoxohexavanadates, describes bis-(trisalkoxo)hexavanadates obtained by post-functionalisation reactions, and details their reactivity towards transition metals and lanthanoid complexes. Chapter Three emphasises the suitability of supramolecular interactions to provide porous materials which have been called Supramolecular Metal-Organic Frameworks (SMOFs). Chapter Four discusses self-assembly of porphyrins in the context of its relevance to photosynthesis.