The immune system in insects represents a highly evolved and dynamic suite of defenses that are pivotal for their survival in the face of diverse pathogens, including bacteria, viruses, fungi, and parasites. Insects rely solely on innate immunity, lacking the adaptive immune responses found in vertebrates. Within this domain, the honey bee (Apis mellifera) emerges not only as an ecologically and economically significant pollinator but also as a critical model for studying insect immunity due to its complex social structure and unique exposure to environmental and pathogenic stressors. This chapter provides an in-depth examination of the molecular and cellular components of insect immunity, focusing particularly on antiviral defenses in honey bees, the roles of immune signaling pathways such as Toll, Imd, Jak/STAT, and RNA interference (RNAi), and how environmental stressors like pesticides and malnutrition compromise immune function. Comparative studies with model organisms such as Drosophila melanogaster and Anopheles gambiae provide further insights into the evolutionary dynamics of immune specialization. Moreover, the COVID-19 pandemic brought renewed attention to viral ecology, indirectly affecting bee research and health through altered environmental conditions and research priorities. The chapter concludes by emphasizing the need for integrative approaches that combine molecular immunology, ecological monitoring, and policy reforms to safeguard pollinators in an era of escalating environmental challenges.