RNA interference (RNAi) is a biological process in which RNA molecules inhibit gene expression or translation by neutralizing targeted mRNA molecules. RNAi is a powerful tool used in molecular biology research to study gene function and regulation. It has also been explored as a potential therapeutic approach for treating various diseases, including cancer and viral infections. RNAi has revolutionized the field of genetics and molecular biology by allowing researchers to selectively silence target genes with high specificity and precision.