Hi Karnaaj.
Analog Audio Interconnects fall into, shall we say two camps; 1.) Single ended (RCA Connectors) and 2.) Balanced (XLR connectors).
The music wave form is just that...a wave form also referred to as Alternating Current or AC. All our reproduced music is AC (not Air Conditioning).
An illustration can be drawn like this: Imagine a straight line with a wave drawn that rides above, we'll call that +, and below, we'll call that -, the straight line. If you got the picture, that's a simple AC wave form.
Single Ended cables carry both the + and - parts of the wave along a single signal conductor(s) path and then there's the ground or return path.
Balanced cables incorporate two signal carrying conductors; one for the + going half of the wave form and one for the - going half of the wave form and then, again, there's a ground or return path.
One benefit of Balanced cables is that common (non-music) noise that rides on both the + and - halves of the wave are cancelled out because they are 180 degrees out of phase with each other. A downside for gear requiring balanced cables is that, if done fully balanced (differential), it requires twice as much circuitry.
One benefit Single Ended cables offer is it's simplicity...much like the sound of a well designed single ended tube or transistor amp is capable of producing. A downside of single ended cables is that a well designed single ended cable will not hide the noise that resides in less well engineered gear.
Other issues are relevant for either or but perhaps this is a good simple primer.
Hope this helps a bit.
