What’s the Difference Between a Mutation and a Strain?

In this week's edition of the Covid Q&A, we look at what makes a variant a variant. In hopes of making this very confusing time just a little less so, each week Bloomberg Prognosis is picking one question sent in by readers and putting it to experts in the field. This week's question comes to us from Myrna in Puerto Rico. Myrna asks:

Is omicron a new strain or a new variant, and is there a difference?