Supernovae have developed into a versatile tool for cosmology. Their
impact on the cosmological model has been profound. Yet, these
cosmological explosions are in several respects still badly understood. 
I will present the current status of the cosmological model as perceived
from supernovae. Constraints on the Hubble constant can be derived from
simple assumption and explosion models. The importance of this new
method is that it does not rely on any assumption of the distance
ladder. The dynamics of the second half of the universal history have
been measured by supernovae. The new projects are trying to determine
the equation of state of the dark energy. I will present the current
status of these searches.