The glossary below contains many of the terms you will find in common use throughout the Symantec Security Response website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.


The prevalence rating replaces Symantec's legacy malicious code rating wild. The prevalence rating evaluates the extent to which a virus is already spreading among computer users. It is based on antivirus submissions from Symantec corporate and consumer Antivirus customers. It is based on a scale of 1 (low) to 5 (high).