What are fuses used for?


I have, I’m sure to many, a very dumb question. I keep reading about fuses.  I have a fairly sophisticated system and have never come across the need for a fuse.
Can someone tell me where these fuses go and what they’re used for?
128x128rvpiano
OK, Wolfie, I’ll give you that - they didn’t work for you. So it’s what, you against 40,000? The smart money is on the 40,000, not some pro audio layabout. 
Why the put downs? If he heard nothing so what. It is his money and his experience. If you heard a huge improvement then good for you. Leave it there. 
Whoa! What? Why the put downs? Hey, phillyb, no offense but I’m afraid you’re not following. Wolfie is claiming everyone who hears the fuse is crazy. And he’s the only sane one because he can’t hear the fuse. Capish? If that ain’t a freakin Catch 22 I don’t know what is!
After trying a few different brands of fuses I heard amazing differences between them all. I thought people would like to hear what I experienced, then I read the thread on fuses and realized I was wrong.
Oh. I should have said that I really don't care what other people think about that. It matters what I think when I am listening to my system. Good thing too because it would be weird if I had to ask what somebody else heard, while I am listening to my system, to enjoy my system.