Are slingshots powerful?

I'm curious, are slingshots really powerful tools? I've seen them used for recreational purposes like shooting pebbles or paper targets, but could they potentially pack a significant punch if used for other purposes? Are there any specific factors that determine the strength of a slingshot, like the material it's made from or the size of the projectile? I'm genuinely interested in understanding the capabilities of this seemingly simple yet intriguing device.