more stuff about cin?

recently i found out that cin doesn't just ask for input, it also can do cin.fail and stuff. What the heck are those? I don't know about those things... maybe tell me briefly about it?

thx.
There are about 400,000 matches on google, some like this one.
https://www.codingunit.com/cplusplus-tutorial-standard-io-cin-and-cout

I recommend doing some of your own research when you wonder about something as common as cin. If something is not clear then this would be a good place to ask.
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