A large collection of antiviruses of different functionality. Antiviruses are usually divided by class and by price. Conventional antiviruses usually have real-time protection modules, anti-virus scanners and cloud protection.
At the same time, anti-viruses of the Internet Security class have more opportunities. They include a Firewall, modules embedded in the browser, a safe environment for running applications in isolated mode, etc. As for the price, free protection is more common among ordinary antiviruses, while powerful antivirus systems are very rare.