A Lightworker is a Monad that has incarnated in a human body with the intention of providing assistance towards awakening, activation, and ascension of individuals. Lightworkers encourage re-Connection. There are currently millions of lightworkers active on planet earth all operating at different levels of consciousness. Some have been with the earth for millennia, some only since Lemuria, some only since Atlantis, and some only since the end of the "dark ages". More recently incarnated lightworkers may be referred to as Starseeds.
Anybody can be a lightworker and in fact most people come to this earth with such a mission in mind. The problem is, indoctrination into The System typically subverts the divine desire to uplift and connect. Lightworkers are are damaged by a violent Toxic Socialization process, and indoctrinated into and Old Energy archetypal rubric that defines us as broken down rejects, and limits our understanding and potential. As a result we settle into "normal" life and Normal Consciousness, unaware of our divinity and our mission, compliant, subservient, and disempowered. In addition, System Agents actively work to subvert lightworker consciousness, disempower, and disconnect.
Sharp, Michael (2006b). The Book of Life: Ascension and the Divine World Order