A skid refers to a type of framework or platform that is used to mount, transport, and support various types of equipment or systems. Skids are commonly used in industries such as oil and gas, chemical processing, water treatment, pharmaceuticals, food and beverage, and construction. They are often designed to house complex equipment or modular systems, making them easier to transport, install, and maintain. Skids are typically used in situations where a complete system or set of equipment needs to be moved as a single unit or pre-assembled for efficiency.