RNA methylation is a biochemical process where a methyl group is added to the RNA molecule. This modification can occur on various RNA types, including messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). Methylation plays a crucial role in regulating RNA stability, splicing, and translation, influencing how genes are expressed. The process is facilitated by specific enzymes known as methyltransferases. These enzymes recognize particular sites on the RNA and add methyl groups, which can affect the RNA's function and interactions with other molecules. Abnormalities in RNA methylation have been linked to various diseases, including cancer and neurological disorders.