A short-range wireless technology, known as NFC, that lets devices exchange data when held a few centimetres apart.
Near field communication works at very short distances, typically about four centimetres or less, using radio frequency at 13.56 megahertz. Because the range is so short, connecting usually requires a deliberate tap. NFC is built into most modern smartphones, many smartwatches, payment cards, transit cards, and building access badges.
The best-known use is contactless payment, where a phone or card communicates with a payment terminal. Other uses include tapping a phone on a sticker to open a restaurant's menu or review page, pairing headphones with a phone, sharing contact details, and checking product authenticity. For example, a museum might place NFC tags beside exhibits so visitors can tap for audio guides. NFC tags can be read by anyone nearby with a compatible device, so they should not store sensitive information unprotected.
Paying by tapping or holding a card, phone, or wearable near a payment terminal, using short-range wireless technology.
Mobile WalletAn app or phone feature that stores payment cards, bank links, or balances so users can pay with their phone.
QR CodeA two-dimensional barcode made of black and white squares that stores information such as a web link or payment details for quick scanning.
Foldables now come from Samsung, Google and Apple. Here's who the big screen really helps, how durable they are in 2026, and what repairs cost before you buy.
Smart glasses now come in 3 main types: camera and audio glasses, glasses with a small display, and tethered screen glasses. Here is what each can do and how to wear them politely.
SSDs are far faster and tougher; hard drives are cheaper per gigabyte. Compare speed, durability and cost, and see the best use for each type of drive.