Adultism said:
I probably sound like an idiot but
What is the difference between component and AV
Technically component cables are a type of AV cable, but what Seraph meant by "three prong AV cable" was "composite video with Stereo RCA audio." Not to get too technical with it, but the difference between composite video and component video is that component video splits the video signal into three different signals, while composite video combines it into one, which the TV has to split back up on its own. Because of the way the TV has to have the video signal split up, and because it's not possible to perfectly split the signals once they've been combined, component allows for much higher quality video than composite; composite is okay for standard def, but can't even handle 480P, let alone 1080P[footnote]which component video can easily handle, but many items that use it, especially Bluray players, tend to lock out anything above 720P or 1080i on them, to avoid people making perfect copies without having to deal with the copy protection built into HDMI[/footnote].
Edit: And not knowing that doesn't really make you sound like an idiot. Home theater is a hobby of mine, and I see people's eyes start to glaze over as soon as I start mentioning standards, even when I'm talking to gamers, who theoretically deal with this stuff all the time as part of their hobby. The average consumer really doesn't care about this kind of thing.
Edit Edit: Oh, and in case it's not clear, the description above is talking exclusively about video cables. Especially when you're talking about game systems, both cable types usually have stereo RCA cables attached. These are just the basic left and right audio cables that we've been using on everything since the start of the last decade. That's why Seraph referred to a composite cable as a "three prong" cable, even though the video itself only has one prong; the other two are for audio, while the component cable will most likely have a full five prongs, three for video, and two for audio. Note that these are bare bones basic audio connections; most of the time, if you're using component video, you're also using a separate cable to hook up to a surround system to provide the audio. The left and right audio plugs are mostly provided as a low-end backup.