Lately, QR codes have been everywhere. You can find them on business cards, print advertisements, even t-shirts. A QR code is a square matrix of black square dots that is used to store information like text, web URLs and even phone numbers. Most commonly, though, they are used to direct people to a website in order to make purchases, gain information or, in some cases, get someone to open a webpage equipped with viruses. These viruses can compromise your security and allow hackers access to passwords and personal information like credit card numbers. How can you avoid this problem? Download a QR scanner that will allow you to preview the URL first, to make sure you trust the website it will direct you to.