What is a wrist grounding strap?
In more detail, it is a wire leading from a technician’s body (a wrist band with metal contact to the skin) to earth ground, with a high (1 megohm) resistance in it. This slowly discharges any static electricity that is built up on the body, to avoid discharging it into an electronic component. An electrostatic discharge (ESD) mat with similar connection to ground is also used to keep the electronic components at earth ground potential.