First off, wifi is just the wireless signal between your internet router/modem inside your house and your device. Prior to that, the data travels through cables of some sort — typically the same cable that brings cable TV. Because the infrastructure is in large part piggybacking on existing infrastructure and doesn’t have to accommodate with shifts in demand like cell towers might (think of a tower near a stadium or in a busy downtown at rush hour vs. demands when there aren’t events of it’s a weekend and workers aren’t around).
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