ROS packages and manifest
The ROS software is divided into packages that can contain various types of programs, images, data, and even tutorials. The specific contents depend on the application for the package. The site http://wiki.ros.org/Packages discusses ROS packages.
A package can contain programs written in Python or C++ to control a robot or another device. For the turtlesim simulator package for example, the package contains the executable code used to change the background color or move a turtle around on the screen. This package also contains images of a turtle for display and files used to create the simulator.
There is another class of packages in ROS called
metapackages that are specialized packages that only contain a package.xml ...
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