So what makes a double bass player different from a bass guitar player?

[Terry McDougal]

I play the double bass.
I just had a wee peek at the bass guitar part of this forum. Well, they might as well be banjo players! They talk a different language.
I known we're a' Jock Tamson's bairns, but they do seem different. Tell me, what do we have in common and in what ways are we different?