Invisible Fence is a pet containment system designed to keep dogs and cats within a designated area without physical barriers. It uses a buried wire around the perimeter of the yard, which communicates with a collar worn by the pet. When the pet approaches the boundary, the collar emits a warning sound, followed by a mild static correction if the pet continues to move closer. This system allows pets to enjoy freedom while ensuring they stay safe within the property. Invisible Fence is often used as an alternative to traditional fences, providing a less intrusive solution for pet owners.