Four basic levels of antivirus products exist: free, paid antivirus, suites, and “premium” suites. Free antivirus software usually provides a bare minimum level of protection. Paid antivirus straddles a middle ground between the basic freebies and the feature-packed suites. One of the biggest drawbacks to going with a free product is the lack of technical support. Free products do give you some flexibility, but you can augment a free tool’s basic security with countless security utilities.”]
Source: https://www.csoonline.com/article/2126256/free-vs–fee–free–paid-antivirus-programs.html