Usb a and usb b have the same electrical characteristics, why are they designed in different shapes?

USB, the abbreviation of English Universal Serial Bus (Universal Serial Bus), is an external bus standard used to regulate the connection and communication between computers and external devices. It is an interface technology applied in the PC field. The connectors of USB A and USB B have the same number of pins and electrical characteristics, but the mechanical appearance is different. Why is it designed like this?

The rectangular USB socket on our computer is a typical USB A. The shape of B-type sockets is mostly square. This is intentional by the designer and can prevent users from connecting one device to another, causing a short circuit.

Type A sockets (female) generally appear on upper-end devices, such as hosts or hubs. Type A plugs (male) are generally used for cables or smaller peripherals, such as a mouse or flash memory. USB B is generally used to connect 3.5-inch mobile hard drives, printers, monitors, etc.

Both have been widely used in the computer ecology, and now they are also under the impact of Type-C. With people's pursuit of lighter, thinner, more portable, and more efficient electronic products, it is only a matter of time before usb a and usb b withdraw from the stage of history.

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