POTS - Plain Old Telephone System
The POTS, or plain old telephone system, has been in existence since the late 1800's. While there have been advances such as touch tone dialing, call waiting and conference calls, the technology remains largely unchanged. Now, however, other technologies are becoming more popular, such as VOIP and cell phones. Despite this, the POTS is a mainstay in homes (though less so for younger people) and businesses.