Comparatives are words used to compare two things, showing how one is different from the other. They often end in "-er" or use "more" before adjectives. For example, in the sentence "This book is better than that one," the word "better" is a comparative form of "good." In English, comparatives help us express differences in qualities like size, age, or speed. For instance, we say "John is taller than Mike" or "this car is faster than that car." Using comparatives makes it easier to understand how two items relate to each other in terms of specific characteristics.