What is the meaning of the term Unbiased estimator?

I was reading an article over internet and it had a question about the Unbiased estimator.
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" An estimator with an expected value (or mean) that is equal to the value of the corresponding population pa-rameter."
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they doubt connected with unbiassed evaluation of an normal deviation occurs in studies generally as a doubt throughout statistical hypothesis. Other than in a few critical predicaments, layed out afterwards, the job possesses small significance in order to applying statistics because it's need is eliminated by means of standard procedures, like the usage of import checks as well as authority durations, or through the use of Bayesian analysis.
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