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It is old syntax, accepting another function as argument and executing it when some condition is met.
callback demo :
https://code.sololearn.com/Wy2AY0u7kOb9/?ref=app
Instead use the new syntax of Promise and async/await for improving readability.
async demo:
https://code.sololearn.com/W9r6G80mFY7p/?ref=app
async lesson:
https://code.sololearn.com/WHg45t9f05if/?ref=app
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