A blue USB port means a USB 3.0 port that transfers at speeds up to 5 gigabits per second (Gbps), while black means the older USB 2.0, which transfers at slower speeds.

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Having said that, there's enough examples in the wild to tell us what an orange USB port could mean. The most basic meaning is that the particular port is USB 3.0 and is capable of charging devices.

A blue USB port means a USB 3.0 port that transfers at speeds up to 5 gigabits per second (Gbps), while black means the older USB 2.0, which transfers at slower speeds.