USB (Universal Serial Bus) was developed in 1990 to simplify the connection between peripheral devices and computers. Due to its compatibility with many platforms and operating systems, as well as its low cost and ease of use, it has become popular. Most modern computers have interfaces for multiple USB connectors, including printers, cameras, and portable storage devices.

The USB standard is developed and maintained by the USB Implementation Forum (USB-IF), an industry organization. In the original specification, USB connectors are only subdivided into A and B connectors. The changes in specifications and manufacturer requirements for USB devices have expanded the range of connectors, but most USB connector products still use A and B connector interfaces.

USB-A type

The USB-A connector is located on the computer host control and hub, and is a flat rectangular interface. This interface is fixed in place by friction, making it easy for users to connect and disconnect. This connector is not a circular pin, but a flat pin that can withstand continuous connections and disconnections well. The USB-A connector provides downstream connections for the host's controller and hub. It is not designed to transmit information from devices to computers. This is crucial as the host controller or hub device is used to provide 5VDC on one of the USB pins.

Usually, AA data cables are not used to connect two computers or USB hubs. This may cause irreparable damage to your computer.

USB-B type

USB-B connectors are used for USB peripheral devices. The USB-B interface is square with slightly angled corners. Like USB-A connectors, it uses the frictional force of the connector host to secure it. SOCKETB is an upstream connector used only for peripheral devices. Therefore, most USB devices require an AB data cable.
USB-C type

USB-C or USB-C connectors are newer USB connectors on the market. The USB-C connector is flexible/symmetrical and can be connected to any USB-C device. The USB-C data cable can transmit USB3.1, USB3.0, USB2.0, and USB1.1 signals. USB-C is typically compatible with USB-A.SUSB-B.USBMICRO-B and other USB connectors, and supports previous versions of the USB specification. USB-C can accommodate every one of these traditional connectors. When connecting two USB 3.1 devices, the USB-C data cable will support existing USB technology (up to 10GBPS) data transfer rates, increasing power output to 20VA and 100W for power supply and charging, such as DISPLAYPORT video and 4-channel audio (speaker and microphone).