Apart from providing just the necessary protection, it also offers full protection. Avast's free version is worth talking about as you might think that a free Antivirus would come only with the most simple features, and that is not the case with Avast. Slowly and quite steadily, Avast has reached the top 5 antiviruses. Avast Antivirus was one of the best antiviruses in the antivirus market in 2020.