RNA Interference (RNAi) is a biological process where small RNA molecules inhibit gene expression. This occurs when double-stranded RNA is introduced into a cell, leading to the degradation of specific messenger RNA (mRNA) molecules. As a result, the production of proteins encoded by those mRNAs is reduced or silenced. RNAi plays a crucial role in regulating various cellular processes, including development and defense against viruses. Researchers utilize RNAi in laboratories to study gene function and develop potential therapies for diseases, including cancer and viral infections. This technique has opened new avenues in genetic research and medicine.