Book excerpt: Artificial Cells are not to reproduce biological cells but to prepare an artificial system for possible uses in medicine and other areas. Many of the ideas on artificial cells are being extensively applied and extended by researchers worldwide, resulting in rapid and exciting progress and discoveries. Different configurations include using emulsion methods and microfluidizers to form microscopic or nano dimension cells called artificial cells, synthetic cells, microcapsules, nanocapsules, liposomes, microparticles, nanoparticles, polymersomes, etc. Macro dimensions artificial cells are used for bioencapsulated cells. Soluble nanobiotherapeutics can be formed by crosslinking proteins and enzymes or by PEG conjugation. The principle of artificial cell has now evolved into nanomedicine, biotherapeutics, blood substitutes, drug delivery, enzyme/gene therapy, cancer therapy, cell/stem cell therapy, nanoparticles, liposomes, bioencapsulation, replicating synthetic cells, cell encapsulation, biosorbent/immunosorbent hemoperfusion/plasmapheresis, regenerative medicine, encapsulated microbe, COVID_19 vaccine, COVID_19 therapy, nanobiotechnology, nanotechnology and other areas.