A landline (also called "main line", "fixed-line" or "fixed network") refers to "[t]raditional wired phone service."
A landline is a telephone line which travels through a solid medium, either metal wire or optical fiber. This is distinguished from a mobile cellular line, where the medium used is the airwaves. Landlines usually cost less than cellular lines and provide better voice quality, and are used when there is no need for mobility or where cellular service is unavailable.
A landline is also used to increase the security of communications, as it cannot be intercepted by a receiver without physical access to the line. (This does not, however, mean that a telephone company will not send the call over the air on some point in the journey.)
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