Purpose of Color Bars...

Hi, I'm going to ask what I assume is a pretty basic question, but being a video newbie, I figure I should ask it/them:

What are the purpose of color bars? I read in the other "color bars" post about official STMPE color bars and wotnot, but why are they there and how do they work?

I assume that you would display color bars on your television or monitor and match it to an actual printed color bar sheet to calibrate your TV.monitor. Yes or no? What's the purpose of having them on your camera?

Basically, why do you use color bars, how do you use them, and how do you get access to them?

Thanks

Dave

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