What is the output for on the back on my speakers?

Yolyx

Estimable
Nov 8, 2014
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[strike]Hi
First off, I do not know anything about speakers. But recently I bought a pair of PC speakers, the Logitech z333 2.1 speakers. On the back there is an input and an output.
IMG_0392.jpg

The input is where I connect my speakers to my pc, but what is the output for?
What do the colours represent?
Can I connect my phone and pc simultaneously with to different cables?
In that case, which cables should I get?

Thanks in advance[/strike]

Sorry, was asking about the wrong thing. Was wondering what the input was for, not the output. Will be making a new thread.