In physics, Everett's multiverse is "a hypothetical collection of potentially diverse observable universes, each of which would comprise everything that is experimentally accessible by a connected community of observers." Thus, the multiverse "is a hypothetical group of multiple universes." In analogy with the cosmic multiverse, the chemical multiverse was defined as "the group of numerical vectors that describe it differently from the same set of molecules". A chemical multiverse can also be seen as a "group of multiple chemical spaces, each one defined by a given set of descriptors." As reviewed recently different chemical space representations can lead to alternative spaces, and the relationships between chemical compounds could change. It has been shown that the concept of chemical multiverse is applicable to different types of molecules such as small organic molecules and peptides for drug discovery applications, food chemicals, and natural products. Eventually, the chemical multiverse can be expanded to any type of compounds, including inorganic compounds.