One of the most direct predictions of QCD is the existence of color-singlet states
called Glueballs, which emerge as a consequence of the gluon field self-interactions.
Despite the outstanding success of QCD as a theory of the strong interaction
and decades of experimental and theoretical efforts, all but the most basic properties of Glueballs are still being debated.
In this talk, I will review efforts aimed to understanding Glueballs and the current status of Glueball searches, including recent experimental results and lattice calculations.