Robot Operating System (ROS)

What is ROS?

Strictly speaking, ROS — the Robot Operating System — isn't really an operating system. It's more like an open-source software framework for robots. It packages hardware abstraction, inter-process communication, device drivers and common algorithms into one infrastructure, so robot builders don't have to start from zero.

What problem does it solve?

Hardware comes in every flavor
Every robot has different sensors, motors and chassis. ROS "abstracts away" those differences, so one codebase can adapt to many devices.
Modules need to talk
A camera, a lidar, a planner and a controller may be written by different teams. ROS gives them one messaging scheme (nodes + topics) so they snap together like building blocks.
Algorithms get reused
Navigation, mapping, localization — the community already has mature packages for all of it. Install one and you're off.

How do the core concepts work?

Node
A small program running on its own, like "the node that reads lidar data".
Topic
A channel where nodes send and receive messages — one publishes, many subscribe.
Service
A request–response style of messaging, for the "ask one, get one" cases.

What's the difference between ROS 1 and ROS 2?

ROS 1 was mostly aimed at academic research — good enough, but limited on real-time performance and security. ROS 2 was redesigned for industrial deployment, adding real-time control, multi-robot support and better security. It's the mainstream choice now.

Bottom line: ROS is the robots' shared infrastructure — it handles the hard low-level work so you can focus on your application.