What Is a QR Code? A Simple Guide
A practical explanation of what QR codes are, how they work, and what you can do with them.
The short answer
A QR code is a two-dimensional barcode — a grid of black and white squares — that stores information. When a phone camera or QR reader scans it, the encoded content is decoded and presented to the user. That content might be a website link, a chunk of text, Wi-Fi credentials, a contact card, or a calendar event.
How QR codes are built
A QR code is made up of modules — the individual dark and light squares in the grid. Three large square patterns in the corners (called finder patterns) help scanning software orient the code. The remaining modules encode your data, along with error correction information that lets the code remain readable even when partially damaged or obscured.
What can a QR code contain?
- • Website URLs — open a web page in the browser
- • Plain text — display a note, address, or message
- • Wi-Fi credentials — offer to join a network
- • Contact cards (vCard) — save contact details to a phone
- • Email — open a pre-addressed email composer
- • Phone numbers — start a call to a number
- • SMS — open a text message composer
- • Locations — open coordinates in a maps app
- • Calendar events — add an event to a calendar
How phones read QR codes
Most modern smartphones can scan QR codes using the built-in camera app — no dedicated QR reader is required. When the camera detects a code, the phone decodes the data and presents an action: open a link, offer to join a network, save a contact, and so on. Dedicated QR reader apps do the same thing but may offer additional features like scanning from saved images.
Static vs dynamic QR codes
A static QR code stores your information directly inside the code. It cannot be changed after creation, but it never expires and needs no hosting. A dynamic QR code stores a short redirect link instead, so the destination can be changed later and scans can be tracked — but it depends on a server and may expire. Veyqora creates static QR codes. Learn more in our static vs dynamic guide.
Real-world examples
- • A restaurant table QR code that opens a digital menu
- • A business card with a vCard QR code that saves contact details
- • A café sign with a Wi-Fi QR code for guest access
- • Product packaging linking to instructions or warranty info
- • An event poster with a QR code that adds the event to your calendar