Answer:
I bind it and it walks. I loose it and it stops.
Face with a tree, skin like the sea. A great beast I am. Yet vermin frightens me.
What is as big as you are and yet does not weight anything?
I drift forever with the current down these long canals theyβve made, Tame, yet wild, I run elusive Multitasking to your aid. Before I came, the world was darker, colder, sometimes, rougher, true. But though I might make living easy, Iβm good at killing people too.
Held firmly in the hands, like a sword it cuts deep. Bloodless strokes, all, then forward we leap.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?