The iPad, which runs on the same operating system as the iPhone, uses Wi-Fi, 3G or LTE mobile data connection to browse the Internet, load and stream media, and install software.
Unfortunately, whenever you are connected to the Internet, you are susceptible to viruses and malware. To stay safe with the iPad, as with any mobile device that connects to the Internet, do not install any programs that you are not familiar with, or click on any strange links. If you are worried, install anti-virus software, which was recently made available for the iPad.
The iTunes app store also automatically provides some protection against downloading rogue applications. In order for an application to be placed in the iTunes store, they must first be submitted for review by Apple. If the application clears the process, it is then put into the app store. However, it is still possible for applications with viruses or malware to be allowed into the app store without being caught, so be sure to read reviews of applications before downloading.