Async in Javascript : How the async/await works?

How the async/await works?. And why this is important for webapps like in the fintech sector.
github.com/eulier1/hard-part-...
Notes : docs.google.com/document/d/1w...
Course : frontendmasters.com/courses/j...
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#model #business #communication #core #concept #transaction #iterator #data #collection #async #value #javascript #mental