Due to its distinctive optical features, cheap cost, eco-friendliness, an abundance of functional groups (such as amino, hydroxyl, and carboxyl), high stability, and electron mobility, carbon dots (CDs), a novel form of carbon-based nanomaterial, have drawn significant scientific attention for years. In this Outlook, we provide a thorough overview of the categorization of CDs based on the analysis of their synthesis, property features, and also their optical characteristics, such as their quantum yield (QY). Additionally, we review several applications of carbon nanomaterial. For example, their roles in being antimicrobial agents, UV blockers/ absorbents, sensors, adsorbents, catalysts as well as fire retardants. Also, their enormous role in treating wastewater resulting from the textile industry has been reviewed.