Virus isolates, variants, strains - what are they?

Many virology terms are being used these days by people who do not understand their meaning. Included are journalists, medical doctors, scientists, lawyers, and people from all walks of life. In normal times this word mis-usage would be so rare that it would not matter. However, because we are in a viral pandemic that affects nearly everyone, I will attempt to explain the meaning of virus isolates, variants, and strains.
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