This document discusses the differences between comparative and superlative forms in English. Comparatives are used to compare two objects or groups, and are formed by adding "-er" or using "more". Superlatives are used to compare three or more objects or groups, and are formed by adding "-est" or using "most". Some examples are provided to illustrate comparing heights and speeds using comparatives and superlatives. The key differences are that comparatives are used for two-way comparisons, while superlatives are used when comparing three or more items.