DSL and fiber-to-the-home are currently the two most common Internet options CenturyLink provides.
DSL is an older infrasructure that uses Centurylink’s legacy phone lines to deliver broadband Internet.
Although DSL services don’t offer the fastest speeds or lowest latencies, they are widely available and usually more cost-effective compared to alternatives since they can transmit data over the same cheap, abundant cables carrying calls.
If you are evaluating DSL services, make sure to check the speeds available in your area, as they can change dramatically.
Fiber-to-the-home (FTTH), on the contrary, is considered the best internet service.
In a FTTH setup, CenturyLink delivers a fiber line the full distance to subscriber residences.
However, installing fiber lines is costly — such that fiber isn't expanding very quickly.