Long Non-Coding RNA (lncRNA) refers to a type of RNA molecule that is longer than 200 nucleotides and does not code for proteins. Unlike messenger RNA (mRNA), which serves as a template for protein synthesis, lncRNAs play various regulatory roles in gene expression and cellular processes. They can influence how genes are turned on or off, impacting cell function and development. These molecules are involved in numerous biological processes, including cell differentiation, genomic imprinting, and chromatin remodeling. Research into lncRNAs is ongoing, as scientists aim to understand their roles in health and disease, including their potential implications in conditions like cancer and neurodegenerative disorders.