  The axion solution of the strong CP problem provides a number of possible
windows to physics beyond the standard model, notably in the form of searches
for solar axions and for galactic axion dark matter, but in a broader context
also inspires searches for axion-like particles in pure laboratory experiments.
We briefly review the motivation for axions, astrophysical limits, their
possible cosmological role, and current searches for axions and axion-like
particles.
