What is an essential feature of a QR code?

The correct answer highlights that QR codes are capable of embedding various types of data. This is a fundamental characteristic of QR codes, as they are designed to hold a significant amount of information that can include URLs, text, contact information, SMS messages, and more. This versatility makes them valuable tools for marketing and information sharing, as they can lead users directly to websites, display promotional content, or facilitate quick communication.

While increasing website traffic, universal acceptance, and the ability to store simple text might be associated with QR codes, they do not define their essential functionality. Therefore, the ability to embed various data types is the key feature that distinguishes QR codes and enhances their usability across different applications.