What is the difference between cout cerr clog of iostream header in c When to use which one

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I looked up the differences between cout, cerr, and clog on the internet but couldn't find a definitive answer.

I'm still not sure when to utilise which.

Can somebody explain to me, using simple programmes and illustrations, when to utilise which one?

I went to this site, which demonstrates a short programme on cerr and clog, however the output may also be gotten using cout.

So I'm not sure what each one is for.
Jul 27 in C++ by Nicholas
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