USB-A is the classic one—big, rectangular, and probably the one you’ve used the most. You’ll find it on older laptops, TVs, gaming consoles, and power adapters. It works fine and is still pretty ...
Blue: Supporting USB 3.0 SuperSpeed technology and above, blue ports identify a device capable of fast data transfer: up to 5 Gbps (that's 5,000 Mbps) -- a significant jump from previous generations.