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> Vega-Lite is also available as the default plotting library in JupyterLab.

What does that mean? I thought plotting was done by what-ever program script was running on the kernel.

JupyterLab outputs have a mime type. Depending on the mimetype, a different renderer is used. For example, text is shown as plain text and an image is binary with the image type (e.g. png). There is also a mimetype for Vega and Vega-Lite JSON.

What this means for you as a user is that you don't need to install the renderer as it comes with the JL frontend.

Vega-Lite is client side so it's not running in the kernel.

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