in expansion of macro ROS

ROS stands for Robot Operating System. It is a framework for building robot software applications. ROS provides a set of tools and libraries that help developers create robotic applications, from low-level drivers to high-level algorithms. ROS enables the creation of modular and reusable code, making it easier to build complex robotics systems. It also provides a communication infrastructure that allows different parts of the system to communicate with each other. ROS has become the de facto standard for robotics development, with a large and active community of developers and users.