The first one is a RCA splitter cable. So, you can stack multiple RCA connections on top of one another. This is similar to this, but has a cable extension on it...
The other piece looks like a headphone connection jack. Not sure what is on the OTHER end of that cable, so it isn't like I can see inside of it, or trace it out to the other end to see exactly what is there, but it appears to be a standard 3.5mm stereo jack. Just like our phones use to have on them.
Like this: