QR codes can house a whole lot of data, from the URL of a webpage or service, to where to directly download an app. Here's how to scan them.

However, with a barcode or "quick response" scanner app, you can also install apps with QR codes that appear on websites, in magazines or on advertisements.

Some developers would lead you to believe you need to download their app to scan QR codes. Spoiler: Your phone can do that with built-in features.