Complex trait genetics is a subfield of genetics that investigates the inheritance patterns, genetic architecture, and underlying molecular mechanisms of complex traits. These phenotypes, unlike simple Mendelian traits, are influenced by interactions among multiple genetic loci and environmental factors. The field employs quantitative and statistical genetic methods, including large-scale genomic analyses, to identify contributing genetic variants, quantify their effects, and understand gene-environment interactions, providing crucial insights into the etiology of common diseases, behavioral traits, and other polygenic characteristics.