What exactly does "decibels" mean

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Ok when I was little I remember reading stuff about Who concerts and SSTs taking off and how many decibels it was

So yeah that's cool translation is oh yeah my chainsaw must be putting out a few decibels

So now I plug and chug through a few books 📚 and finding out that decibels are the result of logarithms and stuff       

So I look on Wikipedia and stuff and see that ok it's deci - Bell ok that makes sense

Then they used it to measure signal loss in miles of cable and stuff

But it seems to me there is much more to this as in ok decibels it not simply how loud something is 

And what about minus decibels 

Anyhow I'm off to try to learn more about this

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Ok it looks like a negative decibel is less than one volt