Improve "Installing Jupyter"

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This is about Project Jupyter | Installing Jupyter.

Three products/applications/software are mentioned there

  1. JupyterLab
  2. Jupyter Notebook
  3. Voilà

Doing some extra research it seems to me that all three have the same purpose and doing the same job or having the same goal. But I am not sure.

Please update that site to answer this questions to new users

  • What are these three components? (A simple link to their main project site would be enough)
  • Do I need all of them at the same time to do the “Jupyter thing”? Are they depending on each other?
  • Or do I have to choose between them?