olemus
programmeerimisel:
täitmisele kuuluva koodi üleandmine
teise koodi ühe parameetrina

Wiktionary:
4. (programming) a function pointer passed as an argument to another function

ülevaateid
https://www.codefellows.org/blog/what-is-a-callback-anyway/

https://en.wikipedia.org/wiki/Callback_(computer_programming)

https://www.freecodecamp.org/news/javascript-callback-functions-what-are-callbacks-in-js-and-how-to-use-them/