What is the difference between Norton Antivirus and Norton Security Scan?

Norton Antivirus is Symantec's full version antivirus program. Norton Security Scan is offered by Symantec & google and is a free version of Norton's popular antivirus, however, it does not include real-time scanning. Norton Security Scan does receive free Virus Definition updates and will scan & remove any existing viruses on your computer, however, you still will not have any real-time protection.