Hosts and Targets
Working with Arduino today means working with two computers at once: the Arduino microcontroller and your PC. In the embedded development world, your PC is the host computer, and the Arduino is the target computer. This is a different concept than the host and device designations for USB. Although the Arduino, with the appropriate additional USB hardware, can play the part of either a USB device or a USB host, the host computer in the embedded development scenario is the computer on which the software is written and compiled.
The Arduino-supplied software is designed to work on most popular operating systems, including Microsoft Windows, Apple Mac OS, and several varieties of Linux.
Software—lots and lots of software—is needed ...
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