Final answer:
Bluetooth is the technology used when pairing devices such as headsets to a smartphone. It allows devices to connect and exchange data over short distances.
Step-by-step explanation:
The technology used when pairing devices such as headsets to a smartphone is Bluetooth. Bluetooth is a wireless communication technology that allows devices to connect and exchange data over short distances.
When you pair a headset to a smartphone using Bluetooth, the smartphone and the headset establish a secure wireless connection. This allows you to use the headset to listen to audio from the smartphone or to make hands-free calls.
Bluetooth technology is widely used in various devices like headphones, speakers, keyboards, and smartwatches, enabling them to connect and communicate with smartphones and other devices.