What do viruses look like?
Each type of virus looks different: they come in many shapes, such as rods and ovals.
Computer viruses are simply computer programs, so they don't really have any physical appearance. You could say that they look like a long string of ones and zeros, or that they look like code. Some viruses may appear on your computer screen disguised as a game or other program - these viruses are called Trojans.
The shape of viruses varies greatly. They can be shaped like small balls (spherical viruses) like strands of spaghetti (flexous viruses) rigid rods, like bullets (baciliform viruses) and like geometric shapes (isocohedral viruses) The smallest viruses can be as small as 20nm (20/1,000,000 of a mm) to as much as 2,000 nm for some flexous plant viruses.
The most basic viruses are composed of either RNA or DNA and are surrounded by a layer of protein subunits. Some viruses have a viral envelope that serves to protect the virus from the immune system and helps with adhesion of a virus to other things. The complex viruses consist of an icosahedral head attached to a helical tail often attached to protein fibers that can look like 'legs'.