In the bind mount "hostPath:containerPath:ro" what dose the ro part do?

bn flag
  1. How do I know I need to add the ro or not?
  2. I know the ro stands for read only but why would you need a read only bind mount?
  3. How would it effect my docker-composer-yml

Example: Containerizing a python app

// docker-composer.yml
    - ./src:/usr/src/app/src:ro

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