Type-c is the latest USB interface appearance standard, which has no difference in direction and can be easily plugged or unplugged. In addition, type-c is an interface type that can be applied to both PC (master device) and external devices (slave devices, such as mobile phones), which is epoch-making.

The USB interface has three different appearances, namely Type-A, Type-B, and Type-c. Type-A is the most widely used interface standard in computers and electronic accessories, and is mostly used in mice, USB drives, and data cables, with the largest volume. Type-B is generally used for external USB devices such as printers, scanners, USBHUB, etc. Type-c has a much smaller volume than Type-A and Type-B, and is the latest USB interface appearance standard. This type of interface has no difference in direction and can be easily plugged or unplugged. In addition, type-c is an interface type that can be applied to both PC (master device) and external devices (slave devices, such as mobile phones), which is epoch-making.

Type-c is a hardware interface form of Universal Serial Bus (USB), and its specifications are published by the USB Developer Forum (USB-IF). Its features include a slimmer design, faster transmission speed (up to 10Gbps on USB 3.1), and more robust power transmission (up to 100W). More importantly, the type-c interface supports dual sided USB interface insertion, officially solving the global problem of "USB never plugs in". After the release of the USB type-C specification, many new Android mobile devices, laptops, desktops, and even game consoles began to use this connection port.

Main functions:

1. Fast

In theory, the maximum transfer rate of the USB C port is 10GB per second. However, Apple stated that the USB C port of the new MacBook has a maximum transfer rate of 5GBps. The maximum output voltage is 20 volts, which can accelerate charging time. The USB-A model has a maximum transmission rate of 5GBps and an output voltage of 5V.

2. Generalist

The USB C port of the new MacBook can transmit data, charge, and also serve as a video output port to connect external display devices. The only question is how Apple can satisfy users who want to do all three things simultaneously.

3. Bidirectional

Unlike the old USB port, power can only be transmitted in one direction. The power transmission of the USB C port is bidirectional, which means it can have two transmission power modes. So, users can not only charge their mobile devices with their laptops, but also use other devices or mobile power sources to charge their laptops.

4. Backward compatibility

USB C can be compatible with the old USB standard, but users need to purchase additional adapters to achieve compatibility. Apple stated that not only will Apple officially sell adapters, but third-party companies can also authorize production.