The uncertainty of the measured Hubble constant (H0) has been reduced by more than a factor of 10 over the past three decades. Despite this significant improvement the discussion on H0 continues unabated. The value of the Hubble constant sets the size and age of the universe. Since H0 is based on an absolute measurement, it is regarded as the most difficult cosmological parameter to determine. In particular, a discrepancy between local determinations of H0 and the ones based on cosmological models has emerged. It has been speculated that if the tension is confirmed an additional cosmological parameter would have to be introduced. The critical measurements of the distance ladder and in particular the use of supernovae as distance indicators will be discussed within this context.