The below is an older news post that is however still very much relevant today. An important reminder to keep your operating system and browsers up to date.
By Robert Siciliano
Gone are the days when you had to click to “accept” a download or install a software update in order to become infected. Now, just opening a compromised web page could allow dangerous code to install on your device.
You just need to visit or “drive by” a web page, without stopping to click or accept any software, and the malicious code can download in the background to your device. A drive-by download refers to the unintentional download of a virus or malicious software (malware) onto your computer or mobile device.
For the full article go to: http://blogs.mcafee.com/consumer/drive-by-download