It defends your Mac from all types of malicious programs—including those created specifically for OS X. With the growing popularity of OS X, malware tends to target specifically this operating system. Incidents involving large-scale botnets comprised of infected Macs did occur: such Trojans as BackDoor.Flashback.39, Trojan.SMSSend and Trojan.Yontoo.1 still pose a threat to unprotected machines.
With Dr.Web for OS X., you can protect your system from these and many other malicious programs created to infect Macs as well as other operating systems. However, bear in mind that, while an update containing a corresponding virus definition has arrived, no anti-virus can protect your Mac against new malware, which hackers tested against latest versions of anti-virus engines. To protect against such malicious programs, you need to use advanced security tools and, of course, be careful when you visit certain sites.