Simplify the following text for a Grade 8 native English-speaking person.
Original: Virology is the study of viruses and virus-like agents : their structure , classification and evolution , their ways to infect and exploit cells for virus reproduction , the diseases they cause , the techniques to isolate and culture them , and their use in research and therapy . Virology is often considered a part of microbiology or of pathology .
Simplified: Virology is the study of viruses such as the cold virus .