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Simple Summary: This is a comprehensive overview of the approved chimeric antigen receptor T-cell products (CAR T-cells), their specific indications, treatment-related side effects, and scientific challenges. CAR T-cells have been introduced to modern hematology over the last years and have changed treatment outcomes in heavily pretreated patients with B-cell and plasma cell malignancies. To date, six commercially available CAR T-cell products have been approved by the U.S. Food and Drug Administration (FDA) and by the European Medicines Agency (EMA). These advanced therapeutic medicinal products induce strong treatment effects but can also cause adverse events that can potentially be life-threatening. Therefore, a thorough understanding of CAR T-cell function and characteristics is essential for safety and efficacy. This review provides a comprehensive overview of the clinical applications of CAR T-cells, focusing on the approved products and emphasizing their benefits but also indicating limitations and challenges. Chimeric antigen receptor (CAR) T-cell therapy has become a powerful treatment option in B-cell and plasma cell malignancies, and many patients have benefited from its use. To date, six CAR T-cell products have been approved by the FDA and EMA, and many more are being developed and investigated in clinical trials. The whole field of adoptive cell transfer has experienced an unbelievable development process, and we are now at the edge of a new era of immune therapies that will have its impact beyond hematologic malignancies. Areas of interest are, e.g., solid oncology, autoimmune diseases, infectious diseases, and others. Although much has been achieved so far, there is still a huge effort needed to overcome significant challenges and difficulties. We are witnessing a rapid expansion of knowledge, induced by new biomedical technologies and CAR designs. The era of CAR T-cell therapy has just begun, and new products will widen the therapeutic landscape in the future. This review provides a comprehensive overview of the clinical applications of CAR T-cells, focusing on the approved products and emphasizing their benefits but also indicating limitations and challenges. [ABSTRACT FROM AUTHOR]