What is the difference between D3 and jQuery?

Question

Referring to this example:

http://vallandingham.me/stepper_steps.html

it seems that the D3 and jQuery libraries are very similar in the sense that they both do D

Answer 1

Great question!

While both libraries share many of the same features, it seems to me that the greatest difference between jQuery and D3 is the focus.

jQuery is a general purpose library with a focus on being cross-browser and being easy to use.

D3 is focused on data (manipulation and visualisation) and supports only modern browsers. And while it does look like jQuery, it's a lot more difficult to use.