An antivirus that passes one of the many tests performed by the AV-Comparatives team receives Standard certification. Those that do better than the basics, or much better, can receive Advanced or Advanced+ certification. Norton participates in all three tests I follow from this lab and received two Advanced+ certifications and one Advanced. Avast, Avira, and Bitdefender Antivirus Plus (along with a few others) achieved a trifecta, with Advanced+ in all three tests.