Immunology of Infections refers to the study of how the immune system recognizes, responds to, and defends against infectious agents such as bacteria, viruses, fungi, and parasites. It involves understanding the roles of immune cells (e.g., T cells, B cells, macrophages) and molecules (e.g., antibodies, cytokines) in detecting pathogens, activating immune responses, and eliminating infections. This field also explores how pathogens evade the immune system and how infections can lead to chronic diseases or immune system dysfunction.