The confusion surrounded the USB-A port's spark symbol (not to be confused with the Thunderbolt symbol, which is a lightning bolt with an arrowhead on the end), which users thought was charging-only.
USB has been around for decades, and the sheer number of USB and Thunderbolt versions in 2025 can be bewildering. Here's what you need to know about USB 3, USB 4, Thunderbolt 3, Thunderbolt 4, and ...
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