The answer to 'types of pipe' is that there are several common types of pipes used in residential plumbing systems, each with their own advantages and disadvantages. The most common types include copper, PVC (polyvinyl chloride), CPVC (chlorinated polyvinyl chloride), and PEX (cross-linked polyethylene).
Copper pipes are durable, corrosion-resistant, and have a long lifespan, but can be more expensive to install. PVC and CPVC pipes are lightweight, inexpensive, and easy to work with, but may not be suitable for hot water applications. PEX is a flexible, freeze-resistant material that is becoming increasingly popular for its ease of installation and cost-effectiveness.