http://www.flickr.com/Viruses are not cells. They are particles made up of nucleic acid, either RNA or DNA packaged in a protein coat. Some virus are surrounded by a membrane known as the envelope.
They cannot reproduce by themselves. They can only reproduce inside a host cell. Viruses are also known as obligate intracellular parasites. There are many hosts for viruses. They are animals, plants and other microorganisms. 
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http://www.flickr.com/ Viruses are extremely small even compared with bacteria. Viruses are too small to be seen under an ordinary microscope, but they can be seen under a electron microscope.
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