svg height and width significantly bigger than the object

Question

What exactly is svg height and width defining? And why in the posted examples is the svg height and width significantly larger than that of the object we are creating?

Answer 1

svg height and width is use to specify drawing space.
it makes sense that the space available should be big enough to contain the object to be drawn.

Answer 2

so the svg size can big as big or small as we want as long as its big enough for the object tofit?

Answer 3

yeah