Compression fittings are specialized connectors used to join two pieces of pipe or tubing. They work by compressing a ring, called a ferrule, around the pipe when a nut is tightened, creating a secure seal. This design allows for easy installation and disassembly, making them popular in plumbing and HVAC systems. These fittings are typically made from materials like brass, plastic, or stainless steel, ensuring durability and resistance to corrosion. They are suitable for various applications, including water supply lines and gas connections, providing a reliable solution for both residential and commercial use.