To elaborate: Why must a USB cable look different from an HDMI cable? Why must we have B-type and C-type chargers? Why use circular audio jacks when it can be “USB’ed” instead? and so on
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There is a benefit to different type of plugs. You don’t want to plug an audio cable in to a socket that carries voltage. Sending line voltage to a sensitive amplifier or preamp could damage it.
Because the do different things, they have different numbers of wires inside them that carry different kinds of electricity in different directions at different specifications. The hardware each cable plugs into are connected to various hardware and software drivers that are expecting these specific kinds of inputs in order to translate them.
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