Virology is the investigation of infections – submicroscopic, parasitic particles of hereditary material contained in a protein coat – and infection like operators. It centers around the accompanying parts of infections: their structure, order and advancement, their approaches to contaminate and abuse have cells for multiplication, their cooperation with have creature physiology and insusceptibility, the sicknesses they cause, the methods to confine and culture them, and their utilization in research and treatment. Virology is a subfield of microbiology.

One fundamental inspiration for the investigation of infections is the way that they cause numerous significant irresistible ailments, among them the normal cold, flu, rabies, measles, numerous types of loose bowels, hepatitis, Dengue fever, yellow fever, polio, smallpox and AIDS. Herpes simplex causes mouth blisters and genital herpes and is under scrutiny as a potential factor in Alzheimer's.

Some infections, known as oncoviruses, add to the improvement of specific types of malignant growth. The best-examined model is the relationship between Human papillomavirus and cervical malignancy: practically all instances of cervical disease are brought about by specific strains of this explicitly transmitted infection. Another model is the relationship of disease with hepatitis B and hepatitis C infections and liver malignant growth.