miRNA, or microRNA, are small non-coding RNA molecules that play important roles in the regulation of gene expression. They are typically about 22 nucleotides in length and can bind to specific mRNA molecules to inhibit their translation or promote their degradation. miRNAs are involved in various biological processes, including development, cell proliferation, differentiation, and apoptosis. Research in the field of miRNA focuses on identifying and characterizing specific miRNAs, understanding their functions and mechanisms of action, and exploring their potential as diagnostic or therapeutic targets for various diseases, such as cancer and neurodegenerative disorders. Scientists are also investigating the role of miRNAs in specific cellular processes and pathways, as well as their interactions with other regulatory molecules. Overall, miRNA research is a rapidly evolving field with the potential to uncover new insights into gene regulation and disease mechanisms.