In this piece, two very concrete aspects of the theories that deal with territorial agglomerations of companies (or clusters) are analyzed. These are, on the one hand, the factors that cause the development of such clusters, studying their origins and life cycles in a particular way. On the other hand, we look at those policies and actions that can be carried out in order to harness these territorial agglomerations. The work aims to obtain a holistic vision of the aforementioned aspects, drawing from significant studies from both academia and the private sector. Among the main conclusions of the article, we highlight the fact that clusters always have a stressed life cycle, in which both internal and external factors influence the formation of clusters. In this sense, the factors that cause a cluster to remain in its stages of growth and maturity for as long as possible, without entering into a phase of decay, are indicated.