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We have undertaken this review to explore the various developments and insights of CAR-T cell therapy during 1989-2023 and its advantages in the treatment of cancer and immune modulation. It is a chimeric antigen receptor T-cell therapy, which is an innovative form of immunotherapy that harnesses the power of the immune system to fight cancer. At first, T cells are extracted from the patient’s blood through a process called leukapheresis. Then the modification has been done in T cells by genetically engineered to express chimeric antigen receptors (CARs) on their surface. These receptors are designed to recognize specific proteins, or antigens, that are found on the surface of cancer cells. Many conventional therapies available in the market for the treatment of cancer and Immuno modulation but most of them having Adverse Drug Reaction (ADR). But CAR-T cells possess upper hand on these conventional Formulations. Once a sufficient number of CAR-T cells have been produced, they are infused back into the patient’s bloodstream. Once reach inside the body, the CAR-T cells recognize and bind to the cancer cells that express the specific antigen targeted by the CAR. This triggers the destruction of the cancer cells by the immune system. CAR-T cell therapy has shown remarkable success in treating certain types of blood cancers, such as acute lymphoblastic leukaemia (ALL), chronic lymphocytic leukaemia (CLL), and certain types of lymphoma. The content of this review will pave the way to work on CAR-T cell therapy. Keywords: CAR-T, Immunotherapy, cancer, antigen, leukemia, lymphoma.