  Clustering plays an important role in the structure of nuclei, especially for
light nuclei in the $p$-shell. In nuclear cluster models these degrees of
freedom are introduced explicitly. In the Resonating Group Method or in the
Generator Coordinate Method the clusters are built from individual nucleons
interacting via an effective nucleon-nucleon interaction; the total wave
function is antisymmetrized. Fermionic Molecular Dynamics (FMD) goes beyond
pure cluster models. It is a microscopic many-body approach using a Gaussian
wave packet basis that includes the harmonic oscillator shell model and
Brink-type cluster model wave functions as special cases. Clustering is not
imposed but appears dynamically in the calculations. The importance of
clustering for the understanding of bound states, resonances and scattering
states is illustrated with examples discussing the charge radii of the Neon
isotopes, the $^3$He($\alpha$,$\gamma$)$^7$Be capture reaction and the cluster
states in the $^{12}$C continuum.
