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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HDMI cables don’t have power requirements. They simply carry a signal. It’s a pretty large plug compared to the rest. It’s capable of transmitting and receiving a signal. Both end devices are powered by other means, due to power requirements. Adding power wires not only make the cable bigger, but can cause issues with picture and sound quality.
USB cables also carry a signal, are capable of transmitting and receiving a signal, and provide a regulated voltage. USB B provides 5 volts, USB C has variable voltage available 5, 9, &, 12 volts & can transfer data faster. They are powered from the computer, a wall wort, or some other USB power supply. They’re used for programming low voltage, low amperage devices, to program the device, and for data transfer from devices that may not see power otherwise.
Headphone jacks and plugs are available in a 3.5mm & 1/4” sizes, depending on how much power you’re trying to send them. The 3.5mm is most common because it’s compact. Both are available in 1 or 2 ring varieties, allowing mono or stereo sound while sharing a ground. The 3.5mm is available in a 3 ring, to allow video as well. The 1/4” plug is great if you’re running an amp to some nice headphones. Headphones are often used when mobile and the deep plug helps prevent accidental disconnects and it’s pretty durable compared to the rest. The 1/4” plug is pretty common with amplified instruments because the size adds to its durability.
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