What does Saytzeff's rule help define in an elimination reaction?

Saytzeff's rule is pivotal in understanding elimination reactions, specifically in predicting the formation of products. This rule states that, during an elimination reaction, the more substituted alkene (the product with more alkyl groups attached to the double bond) tends to be the major product. This preference arises because more substituted alkenes are generally more stable due to hyperconjugation and the inductive effect, where the presence of alkyl groups can stabilize the double bond.

In the context of the question, Saytzeff's rule is indeed focused on differentiating between major and minor products that can form during the elimination process, guiding chemists in anticipating the outcome of these reactions based on the structure of the reactants. This helps in understanding the behavior of compounds during elimination, making it essential for predicting which structural form will dominate in a reaction mixture.