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RCA cables are super handy for moving analog signals around. This is a great way to connect a composite video capable device, like the Raspberry Pi, to a suitable display. They also come in handy if you want to hook up your old-school analog gaming consoles, you know it's always impossible to find an RCA cable when you're hooking up the NES for some Tetris.
These cables are fully shielded and could work well for audio applications as well.