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How Many Types of USB on Earth?

USB ports can be found almost everywhere in the world. Many devices rely on USB ports whether to get charged or to transfer. With the rapid development of USB, people may get confused with the various types of it. In the article, we’re going to help you understand the difference among these types.


Type-A: Most cables have a type-A connector on one end, most peripherals (such as keyboards and mice) have a type-A connector, personal computers usually have multiple type-A ports, and many other devices and power adapters use a type-A port for data transfers and/or charging.

Type-B: An almost square connector, mostly used for printers and other powered devices that connect to a computer. They’re much less common than type-A these days so we’re not going to worry about them here.

Mini-USB: The standard connector type for mobile devices before the micro-USB type came along. As its name suggests, mini-USB is smaller than regular USB, and is still used in some cameras that have non-standard connectors.

Micro-USB: The current standard for mobile and portable devices. It has been adopted by virtually every manufacturer except Apple.

Type-C: A reversible cable that promises higher transfer rates and more power than previous USB types. It’s increasingly being adopted as the standard for laptops and even some phones and tablets. It has even been embraced by Apple for Thunderbolt 3. More on USB-C at the end of this article.

Attention please! Lightning is not a USB standard but Apple’s proprietary connector for iPads and iPhones. It’s a similar size to micro-USB and is compatible with all Apple devices made after September 2012. Older Apple devices use a different and much larger proprietary connector.

According to USB standard, USB can be classified into two categories--USB 2 and USB 3.


The latest USB standard (USB 3) offers faster transfer rates and is, for the most part, backwards-compatible with earlier versions of USB. Standard-A connectors are identical to the Type-A connectors of previous versions, but are usually colored blue to distinguish them.

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They are fully backwards-compatible but the increased speeds are only available when all components are USB 3 compatible.

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