Fluorescent dyes are essential components of many biological and biotechnological applications. However, there are several synonyms for the term "fluorescent dye" that are frequently used in research and industry. Some researchers use the term "fluorophore" to describe a molecule that emits fluorescent light. Additionally, the terms "luminescent marker," "fluorescence probe," and "fluorochrome" can be used to refer to a fluorescent dye. These synonyms highlight the importance of these compounds in imaging, detection, and quantification of biological molecules. Fluorescent dyes, regardless of the term used to describe them, remain a vital tool in scientific research.