Comments by "Javier Flores" (@JJFlores197) on "How the Internet Works in 9 Minutes" video.
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they're showing you a very high level overview of the internet. You have your ISP, your internet service provider. They run their infrastructure (be it, phone line, fiber optic cable, coax, etc) from their main office (central office) to your home. They have intermediary nodes between the CO and your home. So if you have DSL service, your ISP usually runs fiber optic cabling from their CO to the node that services your neighborhood. Then from that node, they run a phone line to your home. Or in the case of cable internet (say Comcast/Xfinity), its the same process, but they would run coaxial cabling instead of phone lines.
You then connect your modem you get from your ISP to the ISP's network via phone line (dial up or DSL) or coaxial cable (if using cable internet) or fiber optic cable (if using fiber internet). Most ISP modems are a combination of a modem, router, and wifi access point, so you usually only have 1 device that provides internet access in your home.
At the ISP end, it gets significantly more complicated. ISPs contract with other ISPs via peering agreements and internet exchange points to connect with other providers and companies, and in turn, providing internet access to their customers. At a very high level, you can think of an internet provider being a very large network that happens to connect to other providers, essentially connecting many gigantic networks together to form the internet.
In other words, think of it as an interstate highway system. I can travel from Sacramento to Reno via I-80. I can travel between Sacramento and Los Angeles via I-5.
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