Electrical ground can mean a reference point for voltage in a circuit, a return path for current, or a safety connection to earth depending on the system. The exact meaning depends on context.
Ground as a reference
In many electronic circuits, ground is treated as 0 volts. Other voltages are measured compared with that point. This helps designers and technicians understand signals and power connections.
Ground as safety
In mains-powered systems, grounding can provide a safer path for fault current and help reduce shock risk. This is different from simply naming a point on a small battery circuit as ground.
Because "ground" can mean different things, it is important to read the circuit and the power source carefully.