  In this chapter, we delve into the formation and primary characteristics of
two significant components within galaxy clusters: the brightest cluster
galaxies and the intracluster light. Drawing upon recent and pertinent studies
in the field, we explore the mechanisms driving their growth from high redshift
to the present day. 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.
