There's multiple types of network media, and the type you use will depend on your needs. One major division is wired versus wireless. Wireless has pros (such as not having to run wires everywhere) and cons (such as more sources of interference, and signals being broadcast), and in many cases wired is the choice for reliability and security.
Even within those categories there's many choices. For wireless there's WiFi, Bluetooth, IR, and microwave/satellite, within wired there's STP/UTP, coax, fiber, and more. Each kind has varying costs and bandwidth possibilities, so it's important to know what your goals are before picking out network media.
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