As electronic products become thinner and lighter, the data interfaces we use are also becoming thinner and lighter. Many old interfaces are eliminated because the thickness of electronic products is not enough. Many interfaces we see now are basically small versions. For example, HDMI has mini-HDMI and microHDMI, and USB also has mini-USB and waterproof TYPE C.

From the perspective of the interface shape, although there are a lot of waterproof TYPE C popular science every time, the shapes of commonly used USB interfaces are mainly divided into three types: USB-A/B/C:

TypeA: It is the standard USB interface we often see. The mainstream can be divided into USB2.0 speed (tens of M/S) and USB3.0 speed (hundreds of M/S). In fact, USB3.0 also has a small amount of Type-A. 110Gbps speed, commonly found on new desktop motherboards. 

TypeB: Commonly found in printers and monitors with touch and USB interfaces, and the frequency of daily use is low. Type-A USB3.0 and 2.0 have the same appearance, and the devices are also compatible with each other, but Type-B is different. The 2.0 version of Type-B cable can be plugged into the 3.0 version interface, but not vice versa. 

Waterproof TYPE C: Today's protagonist, the charging/data interface of most mobile phones, some are also headphone interfaces and video output interfaces. It is also the main interface of Apple's new series of notebooks after the 2015 12-inch Macbook.

Compared with the traditional USB interface, the front and back of the Type-C interface are exactly the same, because no matter how you plug the interface, you will not plug it wrong. Compared with the equally slender MicroB series interface, the interface is simpler and has a lower failure rate. 

Secondly, compared with other A/B interfaces, USB-C has no Mini/Micro distinction, and all C-type interfaces have a unified shape and are very universal. But this premise is that TYPE-C devices are popular enough, otherwise it will cause chaos. 

Although USB has been developed for a long time, the current mainstream and waterproof TYPE C interfaces are only: USB2.0, USB3.0 (3.1Gen1), USB3.1Gen2. The data interfaces of most mobile phones we used in the past and now are basically USB2.0 standard speeds, with a theoretical bandwidth of 480Mbps. The process of converting to MB/S speed units is as follows:

80÷8✖0.8=48MB/S multiplied by 0.8 is the transmission loss value of 8bit/10bit. Without considering finer errors, we will use this method in the following calculations to make it more intuitive. Speaking of USB2.0, many people often talk about the old USB flash drive 2.0. So when copying data to a computer, the reading and writing speed generally does not exceed 40M/S, and it is difficult to copy large files. 

The bandwidth of USB3.0 (later forcibly classified as USB3.1Gen1 series) was also increased to 5Gbps. From the interfaces of MicroB2.0 and 3.0, we can see that the traditional USB interface has different external forms due to the need for pins under different bandwidths and definitions. The waterproof TYPE C interface, regardless of the speed of USB2.0 or 3.0 (3.1Gen1) or 3.1Gen2, the entire interface shape will not change.