What is use of delegates when it use?

Question

Call a method simple and with the help of delegates do same work they why use delegates.

Answer 1

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/delegates/
https://blog.tomhennigan.co.uk/post/46337280924/delegate-methods-in-JUMP_LINK__&&__python__&&__JUMP_LINK
https://stackoverflow.com/questions/9568150/what-is-a-c-delegate
That should explain delegates for Python, C++ and C#