The full form of USB is :

Correct option is D

USB (Universal Serial Bus) is a standard interface used to connect various peripherals to a computer, such as keyboards, mice, printers, and external drives. It supports data transfer and power supply between devices.

Important Key Points:

1. USB was developed in the mid-1990s to standardize connections between devices.
2. It has undergone several upgrades, including USB 2.0, 3.0, and now USB-C.
3. USB ports are commonly found in computers, laptops, and even smartphones.
4. USB-C is the latest version, supporting faster data transfer and higher power delivery.
5. The standardization of USB has made it a universal solution for data and power connectivity.
6. USB can be used for charging devices, making it essential for modern gadgets.