A ground loop is an electrical issue that occurs when there are multiple grounding points in a system, leading to differences in electrical potential. This can create unwanted currents that may cause interference in audio and video equipment, resulting in hums or buzzing sounds. Ground loops are often found in setups involving multiple devices, such as computers, audio systems, or televisions. To prevent ground loops, it's essential to ensure that all devices share a common ground point. Using ground loop isolators or balanced connections can also help eliminate the problem. Proper wiring and grounding techniques are crucial for maintaining a clean and interference-free signal.