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So today I learned that a USB-C port with a little lightning bolt beside it doesn't mean "can charge through this" , but means Thunderbolt.

Why does Thunderbolt still exist as a discrete technology?

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It doesn't in USB4. USB4 adds Thunderbolt compatible signalling for DisplayPort and PCIe tunneling. It also adds some faster data modes. Thunderbolt 4 is separate, but USB4 products can be Thunderbolt 4 with all the features presumably including Thunderbolt 3 compatibility.

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