Save canvas then restore, why is that?

Question

I often see the following code

canvas.save().
canvas translate or rotate
some drawing
canvas.restore

I don\'t understand why we save and then

Answer 1

I guess the simplest way to put it is:

It removes the change in settings, but not the drawing itself.

Settings can include scaling the canvas etc., and it restores the scaling to the initial state when you called canvas.save().