A "Subscriber Line" refers to the physical connection between a telecommunications provider and a customer's premises. This line allows for the transmission of voice, data, and video services, enabling users to access the internet and make phone calls. Subscriber lines can be either analog or digital, depending on the technology used by the provider. Typically, subscriber lines are part of a larger network infrastructure that includes telephone exchanges and copper or fiber optic cables. The quality and speed of the services provided can vary based on the type of subscriber line and the distance from the nearest exchange.