The answer to 'difference between shut-off valve' is that a shut-off valve and a stop valve are two different types of plumbing valves used to control water flow. A shut-off valve is designed to completely stop the flow of water, while a stop valve is used to regulate or reduce the water flow.
Shut-off valves are typically larger and more robust, and are used to isolate sections of the plumbing system for repairs or maintenance. They are often found near major appliances, water heaters, or at the main water supply line. Stop valves, on the other hand, are smaller and more delicate, and are used to fine-tune the water flow, such as under sinks or at faucets.