👉 A virus is a type of infectious organism that can cause diseases in living organisms. These organisms are typically microscopic and have the ability to infect cells, causing them to become infected with the pathogen. Viruses can spread through various means such as contact, eating contaminated food, or being exposed to other individuals who are carrying the virus. They can also replicate themselves and spread through a variety of ways, including budding from an egg or creating new infections in host cells.