MPEG-2 Transport Stream: A packetized MPEG stream that has SI or PSIP tables inserted every 100 ms that tells the decoder what rate to decode content at and what kind of stream it is.

Stereo Audio: RCA connections red/white (left/right) offer analog stereo for those systems that do not have Dolby® (digital) decoders.

AC 3: Also known as Dolby® Digital Decoder 5.1 -- A digital audio standard used in ATSC (North America + Korea). Typically uses a single RCA connector.

YPbPr: An Analog signal format, aka Component Video... Keep in mind that this format can be either SD or HD.

many others to follow...