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In other words, it is like an enhanced digital counterpart of a real object. Human Digital Twins (HDT) have emerged as an evolution of this concept, where the physical object twinned is a human being. Nevertheless, the inherent complexity of human beings turns the creation of their digital representation into a challenging endeavour. In this study, a systematic literature review was conducted that aimed at clarifying the HDT concept and the different aspects a proper HDT should consider. To shed some light on how the different facets of a HDT are addressed in the literature, we delved into its fields of application, the human dimensions a HDT considers, the information handled, its underlying technological frameworks, what quality assessment processes are being applied to HDT, and lastly, those ethical and legal concerns related to HDT. 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