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rosdep installs the additional dependencies that are needed for your source code tree.
You may have X Y and Z in your workspace ~/ros2_foxy
, if they declare dependencies on A, B and C in their package.xml rosdep will attempt to install A, B and C on your system so that you are then able to compile X Y and Z in your workspace. It will also satisfy the runtime dependencies so that you can run the executables after you've built them as they may be different dependencies.