What are the key differences between the Hofmann and Zaitsev elimination reactions?

The key difference between Hofmann and Zaitsev elimination reactions lies in the regiOSelectivity of the products formed. In Hofmann elimination, the least substituted alkene is the major product, while in Zaitsev elimination, the most substituted alkene is the major product. This difference is due to the stability of the alkene products formed in each reaction.