What is the main function of a Digital Subscriber Line (DSL)?

The main function of a Digital Subscriber Line (DSL) is to provide high-speed internet through a single twisted metallic pair. This technology utilizes existing telephone lines to deliver internet access without disrupting voice service. DSL is capable of transmitting data at higher speeds than traditional dial-up connections by employing different frequencies for data and voice, allowing simultaneous usage of the internet and telephone on the same line.

The technology works by modulating signals sent over the copper telephone wires, which can provide a stable and continuous internet connection that is faster than many other forms of broadband, particularly in areas where cable or fiber options are unavailable. This makes DSL a practical option for many users, especially in rural or underserved regions.

Other options, while related to telecommunications in some way, do not accurately define the primary function of DSL. Wireless internet connections and securing transactions pertain to different technologies and purposes, while multiple phone line usage is not a defining characteristic or primary advantage of DSL services.