I'll give it a shot.
In the past, before the internet existed, homes were connected to the national phone system. The national phone system is a bunch of interconnected electric lines that are designed to transport electricity in the frequencies used for speech / sound.
When internet became a thing, people needed electric lines to transport data from their internet providers to their home. Instead of building new electric lines, which would be very expensive, tech companies created a technique called "modem".
A modem transforms computer data into sound data, which can travel through phone lines. Once the sound data reaches the internet provider, another modem turns it back into computer data.
Use IPv6.