decibels for coax, huh?

I know what it means to go 25 mph (or km, sort of) versus 100 MPH (or knots, if I was a sea captain) I even have a idiot level grasp of ohms Ω for my 4Ω speakers (they like power and do better with power) but, I have no idea what it means to loose .5db versus 100db on coaxial cables. I thought db was for decibels? How is that a cable signal(?) measure? Wait, does that mean, the loss you incur with splitters is mostly all about audio? But, with DTV over coax, how is that possible?
What is the scale? (The decibel scale for volume with AV gear is annoyingly hard to use versus one like 0-10 on a dial.) If this is the measure for coax, what is the maximum? (Perhaps in this case, for human use and consumer electronics capability versus NASA use.) What is a **db** in this case and why does my antenna or coax *have* db? Saying you loose db means nothing to people who are not electrical engineers. Can someone explain it? Pretend I am 7 years old. I am 7 years old… actually…

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