Asking about iterator

Question

Can anyone teach me that what is an iterator?
Thanks so much

Answer 1

There are dozens of explanations on the net, have you already tried going through some of these?

Articles:

https://www.bogotobogo.com/cplusplus/stl3_iterators.php

https://www.learncpp.com/cpp-tutorial/introduction-to-iterators/

https://levelup.gitconnected.com/learning-c-the-stl-and-iterators-219abd83d786

Videos:

https://youtu.be/SgcHcbQ0RCQ

https://youtu.be/yTi46Pb32qg

Implementing iterators:

https://internalpointers.com/post/writing-custom-iterators-modern-cpp

https://youtu.be/F9eDv-YIOQ0