What is the meaning of serial usb connection of arduino uno?


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Arduino has built in USB to serial converter so we value on Arduino serial monitor through USB port of Arduino which must be connected to your system


How can I use that for my board?


I used this feature for send messages from my pc to Arduino, in my case a node.js app for drive actions in Arduino, like digital output or digital read.
This same way you can connect any programming language to your arduino, trough Serial Communication…

Watch my case: