Antivirus also termed as anti-malware is software which is used to prevent, detect and remove malicious software named virus from the computer system. Viruses are such program codes that can steal personal information, can do unauthorized resource access and technically harm your computer. Cloud antivirus is the advance form of antivirus programs. AS we know now cloud computing has become popular. Almost all large organizations today rely on the cloud technology. Cloud antivirus is a technical solution that uses light weight agent software. It offloads workload of anti-virus to a cloud based server instead of installing the complete antivirus suite in userís computer. For implementing cloud anti- virus program, a small client program is installed on the desktop of user, which further connects with the web service of security provider. The attached document explains in detail about cloud antivirus program. It also contains the comparison among Panda Cloud and Dr. Curlet.