A USB (Universal Serial Bus) is a type of interface used to connect devices such as computers, cameras, printers, and smartphones. It allows for fast data transfer, power supply, and the connection of peripheral devices.
When a USB device is connected to a computer, the computer sends a request to the device for information about itself, such as the device type, manufacturer, and other specifications. This is known as enumeration.
Once the device is enumerated, the computer assigns a unique address to the device, and the device and computer exchange information using packets. Each packet contains information such as the packet number, data length, and the type of packet.
USB devices can draw power from the computer to operate or charge their batteries. The amount of power a device can draw is limited, and USB specifications define different power modes.
There are different types of USB connectors and cables, such as Type-A, Type-B, Type-C, and mini-USB. The latest USB standard is USB 4.0, which supports high-speed data transfer rates, multiple data and display protocols, and backward compatibility with older USB standards.
In summary, USB works by providing a standard interface and protocol for devices to connect to a computer, exchange information, and draw power. Its versatility and convenience have made it a ubiquitous technology in modern computing.
