Brightest Cluster Galaxies and the Intracluster Light

In this chapter, we delve into the formation and primary characteristics of two significant components within galaxy clusters: the brightest cluster galaxies (BCGs) and the intracluster light (ICL). Drawing upon recent and pertinent studies in the field, we explore the mechanisms driving their growth from high redshift to the present day, i.e., mergers and stellar stripping. Mergers between satellite galaxies and the BCGs account for a significant amount of ICL, as well as stellar stripping which is responsible for the formation of the bulk of it. We also examine how these formation mechanisms are intertwined with the dynamical state of their host clusters, suggesting their potential utility as luminous tracers of dark matter.