Transplant immunology is a branch of immunology that focuses on understanding the immune response triggered by organ and tissue transplants. This field aims to understand how the immune system identifies and reacts to foreign tissues, leading to rejection of transplanted organs in some cases. Researchers in transplant immunology study ways to prevent or suppress these immune responses, increasing the success rates of organ and tissue transplants. This includes studying immunosuppressive drugs, tolerance-inducing strategies, and new technologies to improve outcomes for transplant recipients.