The promoter is a DNA sequence that is located upstream of the gene coding region and has the ability to specifically recognize and bind to RNA polymerase. Its primary function is to bind to RNA polymerase and initiate RNA transcription and synthesis. The enhancer, a DNA sequence located significantly away from the transcription start point, triggers tissue-specific expression and amplifies the promoter's transcriptional activity. The promoter and the enhancer are highly similar. Numerous components constitute both the enhancer and the promoter, and certain components may be present in both. The enhancer is a critical component of gene expression regulation; it determines the timing, location, and intensity of gene expression.