MicroRNAs (miRNAs) are a class of small, non-coding RNAs, typically 20-24 nucleotides in length, that play a crucial role in the regulation of gene expression. They achieve this by binding to messenger RNAs (mRNAs) and either degrading them or inhibiting their translation into proteins. This post-transcriptional regulation is essential for various cellular processes, including development, differentiation, proliferation, and apoptosis.