USB stands for”Universal Serial Bus.”. USB is the most common type of device port found on today’s computers. it is used to connect keyboards, mice, game controllers, printers, scanners, digital cameras, and removable media drives, just to name a few. With the support of a few USB hubs, you can connect up to 127 devices to a single USB port and use them all at once (though that would require quite a bit of dexterity).
USB is faster than older ports, such as serial and parallel ports. The USB 1.1 specification allows data transfer rates up to 12Mb/sec and the USB 2.0 has a maximum transfer rate of 480Mbps. While USB was introduced in 1997, the technology did not really take off until the launch of the Apple iMac (at the end of 1998) which used USB ports exclusively. Ironically, considering that the USB was created and designed by Intel, Compaq, Digital, and IBM. Over the last few years, USB has been a commonly used cross-platform interface for both Macs and PCs.
Why USB have Two Holes in them
USB have two holes in them because In the USB male connector, 2 holes are given so that the female port can carry it safely to ensure that this is not disconnected.
Have you observed that? That’s why we need to use some force to connect and disconnect the USB plug.
As you can see in the image above, the USB female port has two metal parts at the top and bottom that are bent inwards, close to the Crucible Tongs.
Here you can see how these metal parts fit easily into the male USB connector.