Differential fertility is a term that refers to differences in the birth rates of different demographic groups. It describes the phenomenon where some groups of people have higher or lower fertility rates compared to others. Some common synonyms for differential fertility are varied reproductive success, unequal birth rates, divergent birth rates, and disparate fertility patterns. These terms suggest the idea that some groups have more success in achieving their desired family size than others due to various factors, such as social, economic, and cultural circumstances. Understanding these variations in fertility rates can help policymakers and researchers make informed decisions about population growth, reproductive health, and social inequality.