How does a saddle drain work in plumbing systems?

A saddle drain is a type of fitting that is used to connect a smaller pipe to a larger pipe in a Plumbing system. It is typically used to create a branch connection for a new fixture, such as a sink or a toilet. The saddle drain is installed by cutting a hole in the larger pipe, attaching the saddle fitting over the hole, and then connecting the smaller pipe to the fitting. This allows wastewater to flow from the new fixture into the main plumbing system.