In terms of blocking malware, nowadays both free and paid antivirus software is just as effective. In the past, real-time protection, which is the process of stopping malware before it could download, was reserved for paid subscriptions. But most free versions now have this feature, too.
The big difference between fee and paid solutions comes with the extra security tools. One of the most important features after malware protection is a secured firewall. This is because some threats come in through your internet connection, especially if you’re connected to public networks. Firewalls help secure your connections and keep an eye out for anything suspicious trying to sneak in.
Other great tools for online security include password managers, webcam monitors, safe banking tools, and VPN access. With maybe the exception of Avast Free, most antivirus software includes these features with their paid subscriptions only.