DSL or else xDSL are a unit of expertise that offers digital data broadcast in excess of the wires of a local telephone network. DSL firstly stood for digital subscriber loop, but by the year 2009 the term digital subscriber line has been extensively accepted as a more marketing-friendly tenure for Asymmetric Digital Subscriber Line (ADSL), the most admired adaptation of consumer-ready DSL. DSL can be used at the same time with on the unchanged telephone line with normal telephone, as it make use of high frequency bands, while standard telephone make use of low frequency.

The download speed of customer DSL services normally varies from 384 kilobits for each second (kbps) to 20 megabits for each second (Mbps), depending on DSL expertise, line conditions as well as service-level execution. Normally, upload speed is poorer than download speed for ADSL as well as equal to download speed for the rarer Symmetric Digital Subscriber Line (SDSL).