PEX stands for cross-linked polyethylene, a type of plastic commonly used in plumbing and heating systems. It is known for its flexibility, resistance to corrosion, and ability to withstand high temperatures. PEX pipes can be easily bent and shaped, making installation simpler and often quicker than traditional materials like copper or PVC. Another advantage of PEX is its durability. It is less likely to burst in freezing temperatures compared to rigid pipes. Additionally, PEX does not require joints or fittings as frequently, which reduces the risk of leaks. Overall, PEX is a popular choice for modern plumbing applications.