  After presenting three ways of defining a bulge component in disc galaxies,
we introduce the various types of bulges, namely the classical bulges, the
boxy/peanut bulges and the disc-like bulges. We then discuss three specific
topics linked to bulge formation and evolution, namely the coupled time
evolution of the bar, buckling and peanut strengths; the effect of velocity
anisotropy on peanut formation; and bulge formation via bar destruction.
