AIDS, or acquired immunodeficiency syndrome, is a condition resulting from the human immunodeficiency virus (HIV) infection, which leads to a weakened immune system. This syndrome is characterized by a reduction in specific immune cells, notably T cells, and the susceptibility to opportunistic infections that exploit the compromised immune defenses. Such infections may include fungal infections, bacterial diseases, human herpesvirus, or others. Additionally, certain cancers like Kaposi's sarcoma are more prevalent, along with issues like the inability to maintain body weight (wasting syndrome), and in severe cases, AIDS-related complex. Modern treatment for AIDS has progressed significantly, incorporating antiretroviral therapy, medications to boost the immune system, and other therapeutic measures as part of the standard treatment regimen.