Plasmacytoid dendritic cells (pDCs) are key producers of type I and III interferons (IFNs) during viral infections. They are resistant to viral infection and inhibit immune evasion mechanisms by producing large amounts of IFNs. However, pDCs are not always essential for host resistance, as other IFN sources can compensate. pDCs are crucial for antiviral immunity, but their role can be detrimental in some viral infections or autoimmune diseases. pDCs sense viral nucleic acids via TLR7 and TLR9, triggering IFN production. They are resistant to viral infection and can activate T cells. pDCs are found in various tissues and contribute to IFN production in different contexts. During systemic infections, pDCs are mainly located in the spleen and lymph nodes, while during peripheral infections, they contribute to IFN production in draining lymph nodes. pDCs are not always the exclusive source of IFNs, as other cells can also produce them. pDC responses can be beneficial, dispensable, or deleterious depending on the context. pDCs play a critical role in viral control and host resistance, but their function is context-dependent and can be influenced by the virus, tissue type, and host species. Further studies are needed to fully understand the role of pDCs in viral infections and other diseases.Plasmacytoid dendritic cells (pDCs) are key producers of type I and III interferons (IFNs) during viral infections. They are resistant to viral infection and inhibit immune evasion mechanisms by producing large amounts of IFNs. However, pDCs are not always essential for host resistance, as other IFN sources can compensate. pDCs are crucial for antiviral immunity, but their role can be detrimental in some viral infections or autoimmune diseases. pDCs sense viral nucleic acids via TLR7 and TLR9, triggering IFN production. They are resistant to viral infection and can activate T cells. pDCs are found in various tissues and contribute to IFN production in different contexts. During systemic infections, pDCs are mainly located in the spleen and lymph nodes, while during peripheral infections, they contribute to IFN production in draining lymph nodes. pDCs are not always the exclusive source of IFNs, as other cells can also produce them. pDC responses can be beneficial, dispensable, or deleterious depending on the context. pDCs play a critical role in viral control and host resistance, but their function is context-dependent and can be influenced by the virus, tissue type, and host species. Further studies are needed to fully understand the role of pDCs in viral infections and other diseases.