ROS is the Linux of robotics — not an operating system in any kernel sense, but the convention-and-message-bus stack that nearly every modern robot speaks. We walk what nodes, topics, services, and actions actually are, why ROS1's central master became ROS2's distributed DDS, the build-and-launch story, and the honest learning curve before you can move a real robot with it.
Dds
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ROS and ROS2 Explained