Basically, it is used to communicate information, data, and evern electricity between devices. The primary purpose of USB, which stands for Universal Serial Bus (USB), is communication. Chances are even if you don’t know what it is exactly or how it works, you’ve probably heard of it and even if you haven’t, you’ve still probably used it without realizing it. Also, USB 2.0 is usually grey or black, while USB 3.0 is usually blue to differentiate it from 2.0. USB 2.0 offers a top speed of 480 Mbps, while USB 3.0 offers transfer rates of 4.8 Gbps. Key Difference: USB 3.0 is much faster than USB 2.0.
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