One piece of technology that's hard to avoid every day, besides your phone, is a USB port. They're everywhere -- on your laptop, phone, tablet, PlayStation, or even in your car or on your couch. Chances are, while you're reading this, there's a USB port within inches of you. USB ports are common for a good reason: they enable us to charge devices, connect peripherals, or transfer and access data using USB sticks and external hard drives.
Source : https://www.pocket-lint.com/what-yellow-usb-ports-mean/
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