Enhancer RNA, also known as eRNA, is a type of non-coding RNA that plays a crucial role in the regulation of gene expression. It is transcribed from DNA regions called enhancers, which are responsible for boosting the activity of nearby genes. While eRNA is the most common term used to describe this type of RNA molecule, there are other synonyms that have also been used in the scientific literature. Some examples include enhancer-associated RNA (eaRNA), enhancer-derived RNA (edRNA), and transcription start site-associated RNA (TSA RNA). These terms are interchangeable and refer to the same class of non-coding RNAs that play a critical role in the regulation of gene activity.