Carbon quantum dots (CQDs, C-dots, or CDs) are small carbon nanoparticles with some type of surface passivation (less than 10 nm in size). CQDs are a type of carbon nanomaterial that is still in its early stages of development. Contrary to standard quantum carbon dots (CDs) solubility, varying biocompatibility, and functionality. This analysis summarises why CQDs, have multiple pathways for the synthesis of CQD and Improve quantum, physicochemical, and optical output that facilitates for delivery of the bio-image, sensing, and drugs. Science Direct and Google scholar databases used for article selection and papers were obtained and reviewed. Detailed data on the process behind optical properties will be identified, including biodistribution and bio-safety, the toxicological profile of CQDs that favor drug delivery. The applications for the medical delivery of CQDs, particularly as a sensor and antimicrobial, Neurodegenerative, antineoplastic drugs are investigated. The therapeutic implications of CQDs are also explored to boost the circumstances of CQDs as effective agents of delivery of drugs.