Hello everyone. I'm very...very new to electronics, and am looking to get into the 'maker' world, of building small electronics, and projects. One concept though that has bothered me is the concept of grounding. Now I've come to understand that ground wires in homes have that bottom plug reserved for ground pins. And if there is a spike in voltage it is sent through that ground wire, out from the house, and literally into the ground on the utility pole outside. But how does ground work in small electronics? The literal sense of sticking a wire in the ground is lost, so how can electronics have 'ground' wires as well? such as this? Are they used for the same purpose? for example pin one is a ground pin, but what is is grounded to?