Its a javascript graphing library. We've started using it at work a bit for our online dynamic graphs. Its a graphic grammar on top of the d3 js library.

We seem to prefer the lite version, which is simplier.

If you look at the examples, you can click a button a go to a dynamic editor which we rather like.[1]

https://vega.github.io/vega-lite/

If JS and web browsers aren't your thing, they have python version called "altair"

https://altair-viz.github.io

[1]https://vega.github.io/editor/#/examples/vega-lite/stacked_b...