Inflammation happens to be an important physiological process, and it enables survival at the time of infection. It also maintains tissue homeostasis. IFNs, besides anti- and pro-inflammatory cytokines, happen to be critical for a suitable response to damaged cells, pathogens, or irritants in some inflammatory responses. Interferon was given its name for its capability to obstruct viral proliferation. Different types of interferon are considered the most rapidly-created and vital defence against viruses. IFNs are also capable of combating parasitic and bacterial infections and inhibiting the division of cells. Every vertebrate animal produces interferon and, most probably, some invertebrate animals too.