Symantec Virus Definition 2021 Site

Here’s a helpful, clear explanation of (often called virus defs or dat files ): What Are Symantec Virus Definitions? Symantec virus definitions are a set of update files that tell your Symantec antivirus software (like Norton or Symantec Endpoint Protection) how to recognize and block the latest viruses, worms, trojans, and other malware.