Before SCART, many video and audio devices provided lots of different sockets for AV signals. Devices made by different companies could have different and incompatible standards!
SCART attempts to make connecting such devices together much simpler, by providing one plug that contains all the necessary signals, and is standard across different manufacturers. SCART makes connecting such devices very simple, because one cable can connect any two SCART-compatible devices, and the connector is designed so that you cannot insert it incorrectly.
Pin-out:
+------------------------------------------+ | 1 3 5 7 9 11 13 15 17 19 | 21 | \ | 2 4 6 8 10 12 14 16 18 20 \ +--------------------------------------------+
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