Originally from http://rcatohdmi.com/convert-rca-hdmi-s-video-component-video/
This is the signaling standard that your parents where using with their TVs and other gadgets. It can be considered the oldest one for all the signaling standards. It is analog type and is capable of multiple connections.
It is not recommended for digital signals. For our modern digital world today it would be better for you to upgrade instead of using other adaptors to connect with a digital signal.
More at RCA connector